Consolidated Statements of Stockholders Equity - USD ($) $ in Thousands	Total	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)				$ 2,705			$ 765,419		$ (7,361)	$ (1,451,836)
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	(46)	$ (30,099)					$ (33)					$ (20,366)
Stock repurchased and retired (shares)							(3,328,574)
Shares Paid for Tax Withholding for Share Based Compensation					(7,465)
Payments Related to Tax Withholding for Share-based Compensation								21			(25)
Allocated Share-based Compensation Expense								(9,700)
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
Beginning balance at Dec. 31, 2019	(691,073)				$ 2,705			765,419		(7,361)	(1,451,836)
Beginning balance (shares) at Dec. 31, 2019					270,485,308
Ending balance at Jun. 30, 2020	$ (574,714)			$ (2,026)	$ 2,672			756,812		(49,442)	(1,284,756)			$ (2,026)
Ending balance (shares) at Jun. 30, 2020					267,188,547
Comprehensive income (loss):
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Beginning balance at Dec. 31, 2019	$ (691,073)				$ 2,705			765,419		(7,361)	(1,451,836)
Beginning balance (shares) at Dec. 31, 2019					270,485,308
Comprehensive income (loss):
Net income	309,278
Foreign currency translation adjustments	(6,083)
Other comprehensive (loss) income, net of tax	(31,800)
Dividends paid to related-party	(20,650)
Payments of Dividends	(7,553)
Stock repurchased and retired	$ (30,100)
Stock repurchased and retired (shares)	(3,328,574)
Payments Related to Tax Withholding for Share-based Compensation	$ (71)
Allocated Share-based Compensation Expense	1,600
Ending balance at Sep. 30, 2020	(472,107)				$ 2,672			757,576		(39,161)	(1,193,194)
Ending balance (shares) at Sep. 30, 2020					267,188,547
Beginning balance at Mar. 31, 2020	(680,379)				$ 2,672			756,103		(64,310)	(1,374,844)
Beginning balance (shares) at Mar. 31, 2020					267,178,663
Comprehensive income (loss):
Net income	92,776										92,776
Commodity and foreign currency derivatives income, net of tax	12,132									12,132
Commodity and foreign currency derivatives reclassification adjustments, net of tax	(894)									(894)
Foreign currency translation adjustments	3,630									3,630
Other comprehensive (loss) income, net of tax	14,868									14,868
Stock Issued During Period, Shares, Employee Stock Ownership Plan					13,017
Stock-based compensation	718							718
Dividends paid to related-party	(1,993)										(1,993)
Payments of Dividends	(679)										(679)
Stock repurchased and retired	(25)
Shares Paid for Tax Withholding for Share Based Compensation					(3,133)
Payments Related to Tax Withholding for Share-based Compensation								9			(16)
Ending balance at Jun. 30, 2020	(574,714)			$ (2,026)	$ 2,672			756,812		(49,442)	(1,284,756)			$ (2,026)
Ending balance (shares) at Jun. 30, 2020					267,188,547
Comprehensive income (loss):
Net income	94,234										94,234
Commodity and foreign currency derivatives income, net of tax	3,852									3,852
Commodity and foreign currency derivatives reclassification adjustments, net of tax	(1,026)									(1,026)
Foreign currency translation adjustments	7,455									7,455
Other comprehensive (loss) income, net of tax	10,281									10,281
Stock-based compensation	764							764
Dividends paid to related-party	(1,724)										(1,724)
Payments of Dividends	$ (948)										(948)
Stock repurchased and retired (shares)	0
Allocated Share-based Compensation Expense	$ 700
Ending balance at Sep. 30, 2020	(472,107)				$ 2,672			757,576		(39,161)	(1,193,194)
Ending balance (shares) at Sep. 30, 2020					267,188,547
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)										(1,277)
Payments of Dividends	(1,394)										(1,394)
Stock repurchased and retired											(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
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	246,850
Foreign currency translation adjustments	(13,689)
Other comprehensive (loss) income, net of tax	13,867
Dividends paid to related-party	(2,567)
Payments of Dividends	(5,446)
Payments Related to Tax Withholding for Share-based Compensation	(4,074)
Common Stock Repurchased ( from non-related party)	$ (46,200)
Common Stock Repurchased ( from non-related party) (shares)	(4,293,924)
Allocated Share-based Compensation Expense	$ 14,300
Ending balance at Sep. 30, 2021	(110,701)				$ 2,636			761,748		(5,774)	(869,311)
Ending balance (shares) at Sep. 30, 2021					263,586,828
Beginning balance at Mar. 31, 2021	(233,841)				$ 2,673			759,055		(20,717)	(974,852)
Beginning balance (shares) at Mar. 31, 2021					267,257,592
Comprehensive income (loss):
Net income	28,165
Commodity and foreign currency derivatives income, net of tax	7,158									7,158
Commodity and foreign currency derivatives reclassification adjustments, net of tax	4,314									4,314
Foreign currency translation adjustments	8,854									8,854
Other comprehensive (loss) income, net of tax	20,326									20,326
Stock Issued During Period, Shares, Employee Stock Ownership Plan					917,410
Stock-based compensation	15,263				$ 9			15,254
Dividends paid to related-party	(650)										(650)
Payments of Dividends	(2,024)										(2,024)
Stock repurchased and retired					$ (3)			(757)			(3,039)
Stock repurchased and retired (shares)					(294,250)
Payments Related to Tax Withholding for Share-based Compensation	(3,799)
Ending balance at Jun. 30, 2021	(176,560)				$ 2,679			773,552		(391)	(952,400)
Ending balance (shares) at Jun. 30, 2021					267,880,752
Comprehensive income (loss):
Net income	119,886
Commodity and foreign currency derivatives income, net of tax	2,111									2,111
Commodity and foreign currency derivatives reclassification adjustments, net of tax	1,618									1,618
Foreign currency translation adjustments	(9,112)									(9,112)
Other comprehensive (loss) income, net of tax	(5,383)									(5,383)
Stock Issued During Period, Shares, Employee Stock Ownership Plan					0
Stock-based compensation	263				$ 0			263
Dividends paid to related-party	(640)										(640)
Payments of Dividends	(2,028)										(2,028)
Common Stock Repurchased ( from non-related party)	$ (46,200)	$ (46,239)	[1]		$ (43)	[1]		(12,067)	[1]			$ (34,129)	[1]
Common Stock Repurchased ( from non-related party) (shares)	(4,293,924)				(4,293,924)	[1]
Allocated Share-based Compensation Expense	$ 200
Ending balance at Sep. 30, 2021	$ (110,701)				$ 2,636			$ 761,748		$ (5,774)	$ (869,311)
Ending balance (shares) at Sep. 30, 2021					263,586,828

[1] *In the third quarter 2021, stock repurchases of 363,616 shares totaling $3.9 million were pending settlement as of September 30, 2021. This is included in "Accounts payable" on the Condensed Consolidated Balance Sheet. See Note 11 "Earnings per Share" for details.