Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2020		40,232,000
Balance at Dec. 31, 2020	$ 639,470	$ 40	$ 519,579	$ 133,870	$ (14,019)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	98,655	0	0	98,655	0
Foreign currency translation	(1,268)	0	0	0	(1,268)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(3,046)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	9,137	$ 0	0	0	9,137
Repurchases of common stock, net of retirements (shares)		(215,000)
Repurchases of common stock, net of retirements	(71,516)	$ 0	0	(71,516)	0
Share-based compensation	3,837	$ 0	3,837	0	0
Issuance of shares under share-based compensation plans (shares)		69,000
Issuance of stock under share-based compensation plans	2,912	$ 0	2,912	0	0
Declaration of cash dividends	(23,299)	$ 0	0	(23,299)	0
Balance (in shares) at Mar. 31, 2021		40,086,000
Balance at Mar. 31, 2021	657,928	$ 40	526,328	137,710	(6,150)
Balance (in shares) at Dec. 31, 2020		40,232,000
Balance at Dec. 31, 2020	639,470	$ 40	519,579	133,870	(14,019)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	358,350			358,350
Foreign currency translation	34
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(2,327)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	$ 6,980
Balance (in shares) at Jun. 30, 2021	40,131,570	40,131,000
Balance at Jun. 30, 2021	$ 874,748	$ 40	535,046	346,667	(7,005)
Balance (in shares) at Mar. 31, 2021		40,086,000
Balance at Mar. 31, 2021	657,928	$ 40	526,328	137,710	(6,150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	259,695	0	0	259,695	0
Foreign currency translation	1,302	0	0	0	1,302
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	719
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,157)	$ 0	0	0	(2,157)
Repurchases of common stock, net of retirements (shares)		(45,000)
Repurchases of common stock, net of retirements	(18,619)	$ 0	0	(18,619)	0
Share-based compensation	3,712	$ 0	3,712	0	0
Issuance of shares under share-based compensation plans (shares)		90,000
Issuance of stock under share-based compensation plans	5,006	$ 0	5,006	0	0
Declaration of cash dividends	$ (32,119)	$ 0	0	(32,119)	0
Balance (in shares) at Jun. 30, 2021	40,131,570	40,131,000
Balance at Jun. 30, 2021	$ 874,748	$ 40	535,046	346,667	(7,005)
Balance (in shares) at Dec. 31, 2021	40,192,901	40,193,000
Balance at Dec. 31, 2021	$ 1,071,393	$ 40	551,963	526,874	(7,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	179,261	0	0	179,261	0
Foreign currency translation	(214)	0	0	0	(214)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(3,866)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	11,598	$ 0	0	0	11,598
Repurchases of common stock, net of retirements (shares)		(138,000)
Repurchases of common stock, net of retirements	(62,420)	$ 0	0	(62,420)	0
Share-based compensation	3,657	$ 0	3,657	0	0
Issuance of shares under share-based compensation plans (shares)		55,000
Issuance of stock under share-based compensation plans	3,135	$ 0	3,135	0	0
Declaration of cash dividends	(32,132)	$ 0	0	(32,132)	0
Balance (in shares) at Mar. 31, 2022		40,110,000
Balance at Mar. 31, 2022	$ 1,174,278	$ 40	558,755	611,583	3,900
Balance (in shares) at Dec. 31, 2021	40,192,901	40,193,000
Balance at Dec. 31, 2021	$ 1,071,393	$ 40	551,963	526,874	(7,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	486,544			486,544
Foreign currency translation	(7,339)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(5,497)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	$ 16,491
Balance (in shares) at Jun. 30, 2022	39,588,231	39,588,000
Balance at Jun. 30, 2022	$ 1,229,058	$ 40	564,641	662,709	1,668
Balance (in shares) at Mar. 31, 2022		40,110,000
Balance at Mar. 31, 2022	1,174,278	$ 40	558,755	611,583	3,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	307,283	0	0	307,283	0
Foreign currency translation	(7,125)	0	0	0	(7,125)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(1,631)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	4,893	$ 0	0	0	4,893
Repurchases of common stock, net of retirements (shares)		(547,000)
Repurchases of common stock, net of retirements	(216,261)	$ 0	0	(216,261)	0
Share-based compensation	3,914	$ 0	3,914	0	0
Issuance of shares under share-based compensation plans (shares)		25,000
Issuance of stock under share-based compensation plans	1,972	$ 0	1,972	0	0
Declaration of cash dividends	$ (39,896)	$ 0	0	(39,896)	0
Balance (in shares) at Jun. 30, 2022	39,588,231	39,588,000
Balance at Jun. 30, 2022	$ 1,229,058	$ 40	$ 564,641	$ 662,709	$ 1,668