Quarterly report pursuant to Section 13 or 15(d)

Derivatives. (Details) - Schedule of recognized gains (losses) for derivatives

v3.20.2
Derivatives. (Details) - Schedule of recognized gains (losses) for derivatives - Commodity contracts [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gains (Losses), Statements of Operations Location Cost of goods sold   Cost of goods sold  
Realized Gains (Losses) $ (531) $ 2,262 $ 47 $ (2,150)
Unrealized Gains (Losses), Statements of Operations Location Cost of goods sold   Cost of goods sold  
Unrealized Gains (Losses) $ 2,113 $ (5,582) $ 1,535 $ 3,715