Derivatives. (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of derivatives not designated as hedging instruments

	As of March 31, 2021
	Assets			Liabilities
Type of Instrument	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Commodity contracts	Derivative assets	$	22,355	Derivative liabilities	$	4,741

	As of December 31, 2020
	Assets			Liabilities
Type of Instrument	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Cash collateral balance	Other current assets	$	520
Commodity contracts	Derivative assets	$	17,149	Derivative liabilities	$	—

Schedule of recognized gains (losses) for derivatives

		Realized Gains
		For the three months Ended
		March 31,
Type of Instrument	Statements of Operations Location	2021		2020
Commodity contracts	Cost of goods sold	$	6,185	$	—
		$	6,185	$	—

		Unrealized Gains
		For the three months Ended March 31,
Type of Instrument	Statements of Operations Location	2021		2020
Commodity contracts	Cost of goods sold	$	4,358	$	—
		$	4,358	$	—