Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements. (Details) - Schedule of recurring and nonrecurring fair value measurements

v3.21.1
Fair Value Measurements. (Details) - Schedule of recurring and nonrecurring fair value measurements - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Assets $ 93,032 $ 88,492
Liabilities:    
Liabilities (2,837)
Derivative financial instruments [Member]    
Assets:    
Assets 17,149 2,438
Long-lived assets held-for-sale [Member]    
Assets:    
Assets 58,295 70,400
Defined Benefit Plan Assets Large U.S. Equity [Member]    
Assets:    
Assets [1],[2] $ 5,470 $ 4,654
Benefit Plan Percentage Allocation [1],[2] 31.00% 30.00%
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Assets:    
Assets [1],[3] $ 2,605 $ 2,348
Benefit Plan Percentage Allocation [1],[3] 15.00% 15.00%
Defined Benefit Plan Assets International Equity [Member]    
Assets:    
Assets [1],[4] $ 2,921 $ 2,596
Benefit Plan Percentage Allocation [1],[4] 17.00% 17.00%
Defined Benefit Plan Assets Fixed Income [Member]    
Assets:    
Assets [1],[5] $ 6,592 $ 6,056
Benefit Plan Percentage Allocation [1],[5] 37.00% 38.00%
Derivative financial instruments [Member]    
Liabilities:    
Liabilities   $ (1,860)
Level 1 [Member]    
Assets:    
Assets $ 17,149 2,438
Liabilities:    
Liabilities (1,860)
Level 1 [Member] | Derivative financial instruments [Member]    
Assets:    
Assets 17,149 2,438
Level 1 [Member] | Long-lived assets held-for-sale [Member]    
Assets:    
Assets
Level 1 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Assets:    
Assets [1],[2]
Level 1 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Assets:    
Assets [1],[3]
Level 1 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Assets:    
Assets [1],[4]
Level 1 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Assets:    
Assets [1],[5]
Level 1 [Member] | Derivative financial instruments [Member]    
Liabilities:    
Liabilities   (1,860)
Level 2 [Member]    
Assets:    
Assets 17,588 15,654
Liabilities:    
Liabilities
Level 2 [Member] | Derivative financial instruments [Member]    
Assets:    
Assets
Level 2 [Member] | Long-lived assets held-for-sale [Member]    
Assets:    
Assets
Level 2 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Assets:    
Assets [1],[2] 5,470 4,654
Level 2 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Assets:    
Assets [1],[3] 2,605 2,348
Level 2 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Assets:    
Assets [1],[4] 2,921 2,596
Level 2 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Assets:    
Assets [1],[5] 6,592 6,056
Level 2 [Member] | Derivative financial instruments [Member]    
Liabilities:    
Liabilities  
Level 3 [Member]    
Assets:    
Assets 58,295 70,400
Liabilities:    
Liabilities (977)
Level 3 [Member] | Derivative financial instruments [Member]    
Assets:    
Assets
Level 3 [Member] | Long-lived assets held-for-sale [Member]    
Assets:    
Assets 58,295 70,400
Level 3 [Member] | Defined Benefit Plan Assets Large U.S. Equity [Member]    
Assets:    
Assets [1],[2]
Level 3 [Member] | Defined Benefit Plan Assets Small/Mid U.S. Equity [Member]    
Assets:    
Assets [1],[3]
Level 3 [Member] | Defined Benefit Plan Assets International Equity [Member]    
Assets:    
Assets [1],[4]
Level 3 [Member] | Defined Benefit Plan Assets Fixed Income [Member]    
Assets:    
Assets [1],[5]
Level 3 [Member] | Derivative financial instruments [Member]    
Liabilities:    
Liabilities  
Warrants [Member]    
Liabilities:    
Liabilities   (977)
Warrants [Member] | Level 1 [Member]    
Liabilities:    
Liabilities  
Warrants [Member] | Level 2 [Member]    
Liabilities:    
Liabilities  
Warrants [Member] | Level 3 [Member]    
Liabilities:    
Liabilities   $ (977)
[1] See Note 10 for accounting discussion.
[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.