Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Affiliated Entity	Affiliated Entity	Accounting Standards Update 2016-13	Common Stock	Common Stock Affiliated Entity	Additional Paid-in Capital	Accumulated Other Comprehensive Income(Loss)	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Affiliated Entity	Retained Earnings (Accumulated Deficit) Accounting Standards Update 2016-13
Beginning balance at Dec. 31, 2019	$ (691,073)			$ (2,026)	$ 2,705		$ 765,419	$ (7,361)	$ (1,451,836)		$ (2,026)
Beginning balance (shares) at Dec. 31, 2019					270,485,308
Comprehensive income (loss):
Net income	122,268								122,268
Commodity and foreign currency derivatives income, net of tax	(37,577)							(37,577)
Commodity and foreign currency derivatives reclassification adjustments, net of tax	(2,204)							(2,204)
Foreign currency translation adjustments	(17,168)							(17,168)
Other comprehensive (loss) income, net of tax	(56,949)							(56,949)
Stock Issued During Period, Shares, Employee Stock Ownership Plan					29,394
Stock-based compensation	405						405
Dividends paid to related-party	(16,933)								(16,933)
Payments of Dividends	(5,926)								(5,926)
Stock Repurchased and Retired During Period, Shares						(3,328,574)
Stock Repurchased and Retired During Period, Value	(46)	$ (30,099)				$ (33)				$ (20,366)
Shares Paid for Tax Withholding for Share Based Compensation					(7,465)
Payments Related to Tax Withholding for Share-based Compensation							21		(25)
Ending balance at Mar. 31, 2020	(680,379)				$ 2,672		756,103	(64,310)	(1,374,844)
Ending balance (shares) at Mar. 31, 2020					267,178,663
Comprehensive income (loss):
Commodity and foreign currency derivatives income, tax	10,322
Commodity and foreign currency derivatives reclassification adjustments, tax	605
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ (163)
Common stock dividend declared (usd per share)	$ 0.085		$ 0.085
Allocated Share-based Compensation Expense	$ 300						(9,700)
Beginning balance at Dec. 31, 2020	(329,385)				$ 2,672		758,354	(19,641)	(1,070,770)
Beginning balance (shares) at Dec. 31, 2020					267,188,547
Comprehensive income (loss):
Net income	98,799
Commodity and foreign currency derivatives income, net of tax	11,660							11,660
Commodity and foreign currency derivatives reclassification adjustments, net of tax	695							695
Foreign currency translation adjustments	(13,431)							(13,431)
Other comprehensive (loss) income, net of tax	(1,076)							(1,076)
Stock Issued During Period, Shares, Employee Stock Ownership Plan					92,135
Stock-based compensation	767				$ 1		766
Dividends paid to related-party	(1,277)								(1,394)
Payments of Dividends	(1,394)								(1,277)
Stock Repurchased and Retired During Period, Value	0								(210)
Shares Paid for Tax Withholding for Share Based Compensation					(23,090)
Payments Related to Tax Withholding for Share-based Compensation	(275)						65		(210)
Ending balance at Mar. 31, 2021	(233,841)				$ 2,673		$ 759,055	$ (20,717)	$ (974,852)
Ending balance (shares) at Mar. 31, 2021					267,257,592
Comprehensive income (loss):
Commodity and foreign currency derivatives income, tax	(3,144)
Commodity and foreign currency derivatives reclassification adjustments, tax	(187)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ 0
Common stock dividend declared (usd per share)	$ 0.01		$ 0.01
Allocated Share-based Compensation Expense	$ 700