Derivative Financial Instruments Fair Value (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair value of derivative assets and liabilities
Derivative, fair value, net	$ (616,500,000)	$ (168,200,000)
Derivative assets, current	31,303,000	31,203,000
Derivative assets, noncurrent	13,534,000	23,150,000
Total derivative assets	44,837,000	54,353,000
Derivative liabilities, current	545,062,000	200,189,000
Derivatives liabilities, noncurrent	116,273,000	22,331,000
Total derivative liabilities	(661,335,000)	(222,520,000)
Derivative asset, amounts not offset in the accompanying balance sheets	(44,370,000)	(53,598,000)
Derivative liabilities, amounts not offset in the accompanying balance sheets	44,370,000	53,598,000
Derivative asset, fair value, net amounts	467,000	755,000
Derivative liabilities, fair value, net amounts	(616,965,000)	(168,922,000)
Not Designated as Hedging Instrument [Member]
Fair value of derivative assets and liabilities
Derivative assets, current	31,303,000	31,203,000
Derivative assets, noncurrent	13,534,000	23,150,000
Derivative liabilities, current	545,062,000	200,189,000
Derivatives liabilities, noncurrent	116,273,000	22,331,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair value of derivative assets and liabilities
Total derivative assets	44,837,000	54,353,000
Total derivative liabilities	$ 661,335,000	$ 222,520,000