| FAIR VALUE MEASUREMENTS. | 
 9.
FAIR VALUE MEASUREMENTS. 
  
The
fair value hierarchy prioritizes the inputs used in valuation techniques into three levels, as follows: 
  
 | 
● | 
Level
                                            1 – Observable inputs – unadjusted quoted prices in active markets for identical
                                            assets and liabilities; | 
  
  
 | 
● | 
Level
                                            2 – Observable inputs other than quoted prices included in Level 1 that are observable
                                            for the asset or liability through corroboration with market data; and | 
  
  
 | 
● | 
Level
                                            3 – Unobservable inputs – includes amounts derived from valuation models where
                                            one or more significant inputs are unobservable. For fair value measurements using significant
                                            unobservable inputs, a description of the inputs and the information used to develop the
                                            inputs is required along with a reconciliation of Level 3 values from the prior reporting
                                            period. | 
  
  
Pooled
separate accounts – Pooled separate accounts invest primarily in domestic and international stocks, commercial paper or
single mutual funds. The net asset value is used as a practical expedient to determine fair value for these accounts. Each pooled separate
account provides for redemptions by the Retirement Plan at reported net asset values per share, with little to no advance notice requirement,
therefore these funds are classified within Level 2 of the valuation hierarchy. 
  
Long-Lived
Assets Held-for-Sale – The Company recorded its long-lived assets associated with its property and equipment held-for-sale
at fair value at March 31, 2022 and December 31, 2021 of $1,000,000. The fair values of these assets are based on observable values for
the assets through corroboration with market data and are designated as Level 3 inputs. 
  
Other
Derivative Instruments – The Company’s other derivative instruments consist of commodity positions. The fair values
of the commodity positions are based on quoted prices on the commodity exchanges and are designated as Level 1 inputs. 
  
The
following table summarizes recurring and nonrecurring fair value measurements by level at March 31, 2022 (in thousands): 
  
  
    |   | 
  | 
    Fair
    Value | 
  | 
  | 
    Level
    1 | 
  | 
  | 
    Level
    2 | 
  | 
  | 
    Level
    3 | 
  | 
 
  
    | Assets: | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
 
  
    | Derivative
    financial instruments | 
  | 
    $ | 
19,498 | 
  | 
  | 
    $ | 
19,498 | 
  | 
  | 
    $ | 
—  | 
  | 
  | 
    $ | 
—  | 
  | 
 
  
    | Long-lived
    assets held-for-sale | 
  | 
      | 
1,000 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
1,000 | 
  | 
 
  
    |   | 
  | 
    $ | 
20,498 | 
  | 
  | 
    $ | 
19,498 | 
  | 
  | 
    $ | 
—  | 
  | 
  | 
    $ | 
1,000 | 
  | 
 
  
    | Liabilities: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    |   | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Derivative financial instruments | 
  | 
    $ | 
(27,487 | 
) | 
  | 
    $ | 
(27,487 | 
) | 
  | 
    $ | 
—  | 
  | 
  | 
    $ | 
—  | 
  | 
 
   
  
The
following table summarizes recurring and nonrecurring fair value measurements by level at December 31, 2021 (in thousands): 
  
  
    |   | 
  | 
    Fair
    Value | 
  | 
  | 
    Level
    1 | 
  | 
  | 
    Level
    2 | 
  | 
  | 
    Level
    3 | 
  | 
  | 
    Benefit
    Plan  Percentage  Allocation | 
  | 
 
  
    | Assets: | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
 
  
    | Derivative
    financial instruments | 
  | 
    $ | 
15,839 | 
  | 
  | 
    $ | 
15,839 | 
  | 
  | 
    $ | 
—  | 
  | 
  | 
    $ | 
—  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Long-lived assets held-for-sale | 
  | 
      | 
1,000 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
1,000 | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Defined benefit plan
    assets(1) | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | (pooled separate accounts): | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Large U.S. Equity(2) | 
  | 
      | 
5,612 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
5,612 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
28 | 
% | 
 
  
    | Small/Mid U.S. Equity(3) | 
  | 
      | 
3,684 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
3,684 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
18 | 
% | 
 
  
    | International Equity(4) | 
  | 
      | 
2,909 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
2,909 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
15 | 
% | 
 
  
    | Fixed Income(5) | 
  | 
      | 
7,782 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
7,782 | 
  | 
  | 
      | 
—  | 
  | 
  | 
      | 
39 | 
% | 
 
  
    |   | 
  | 
    $ | 
36,826 | 
  | 
  | 
    $ | 
15,839 | 
  | 
  | 
    $ | 
19,987 | 
  | 
  | 
    $ | 
1,000 | 
  | 
  | 
      | 
  | 
  | 
 
  
    |   | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Liabilities: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
  
    | Derivative financial instruments | 
  | 
    $ | 
(13,582 | 
) | 
  | 
    $ | 
(13,582 | 
) | 
  | 
    $ | 
—  | 
  | 
  | 
    $ | 
—  | 
  | 
  | 
      | 
  | 
  | 
 
   
  
| (1) | 
Included in other assets in the consolidated balance sheets. | 
  
| (2) | 
This category includes investments in funds comprised of equity securities of large U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund. | 
  
| (3) | 
This category includes investments in funds comprised of equity securities of small- and medium-sized U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund. | 
  
| (4) | 
This category includes investments in funds comprised of equity securities of foreign companies including emerging markets. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund. | 
  
| (5) | 
This category includes investments in funds comprised of U.S. and foreign investment-grade fixed income securities, high-yield fixed income securities that are rated below investment-grade, U.S. treasury securities, mortgage-backed securities, and other asset-backed securities. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund. | 
  
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