CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in- Capital		Accumulated Other Comprehensive Income (Loss)	Treasury Stock		Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020			55,535,554
Beginning balance at Dec. 31, 2020		$ (5,752)	$ 951	$ 233,921		$ (4,646)	$ (1,260,478)		$ 1,024,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		22,337							22,337
Other comprehensive income (loss), net of tax		52				52
Share-based payment activity (in shares)	[1]		48,781
Share-based payment activity		7,644		3,617	[1]		4,030	[1]	(3)	[1]
Dividends declared		0
Treasury purchases (in shares)			(46,499)
Treasury purchases		(5,046)					(5,046)
Ending balance (in shares) at Mar. 31, 2021			55,537,836
Ending balance at Mar. 31, 2021		19,235	$ 951	237,538		(4,594)	(1,261,494)		1,046,834
Beginning balance (in shares) at Dec. 31, 2020			55,535,554
Beginning balance at Dec. 31, 2020		(5,752)	$ 951	233,921		(4,646)	(1,260,478)		1,024,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		224,874
Other comprehensive income (loss), net of tax		66
Ending balance (in shares) at Sep. 30, 2021			55,630,704
Ending balance at Sep. 30, 2021		212,146	$ 951	253,361		(4,580)	(1,261,926)		1,224,340
Beginning balance (in shares) at Mar. 31, 2021			55,537,836
Beginning balance at Mar. 31, 2021		19,235	$ 951	237,538		(4,594)	(1,261,494)		1,046,834
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		85,882							85,882
Other comprehensive income (loss), net of tax		71				71
Share-based payment activity (in shares)			111,895
Share-based payment activity		12,583		9,066			3,516		1
Dividends declared		(12,521)							(12,521)
Treasury purchases (in shares)			(2,738)
Treasury purchases		(317)					(317)
Ending balance (in shares) at Jun. 30, 2021			55,646,993
Ending balance at Jun. 30, 2021		104,933	$ 951	246,604		(4,523)	(1,258,295)		1,120,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		116,655							116,655
Other comprehensive income (loss), net of tax		(57)				(57)
Share-based payment activity (in shares)			23,757
Share-based payment activity		7,808		6,757			1,045		6
Dividends declared		(12,517)							(12,517)
Treasury purchases (in shares)			(40,046)
Treasury purchases		(4,676)					(4,676)
Ending balance (in shares) at Sep. 30, 2021			55,630,704
Ending balance at Sep. 30, 2021		$ 212,146	$ 951	253,361		(4,580)	(1,261,926)		1,224,340
Beginning balance (in shares) at Dec. 31, 2021		55,609,226	55,609,226
Beginning balance at Dec. 31, 2021		$ 265,882	$ 951	259,317		(4,574)	(1,265,032)		1,275,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		67,391							67,391
Other comprehensive income (loss), net of tax		(134)				(134)
Share-based payment activity (in shares)	[1]		262,008
Share-based payment activity	[1]	9,558		6,068			3,486		4
Dividends declared	[1]	(13,250)							(13,250)
Treasury purchases (in shares)			(100,912)
Treasury purchases		(14,802)					(14,802)
Ending balance (in shares) at Mar. 31, 2022			55,770,322
Ending balance at Mar. 31, 2022		$ 314,645	$ 951	265,385		(4,708)	(1,276,348)		1,329,365
Beginning balance (in shares) at Dec. 31, 2021		55,609,226	55,609,226
Beginning balance at Dec. 31, 2021		$ 265,882	$ 951	259,317		(4,574)	(1,265,032)		1,275,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		276,639
Other comprehensive income (loss), net of tax		$ (1,139)
Ending balance (in shares) at Sep. 30, 2022		53,773,667	53,773,667
Ending balance at Sep. 30, 2022		$ 284,511	$ 951	284,092		(5,713)	(1,507,423)		1,512,604
Beginning balance (in shares) at Mar. 31, 2022			55,770,322
Beginning balance at Mar. 31, 2022		314,645	$ 951	265,385		(4,708)	(1,276,348)		1,329,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		106,168							106,168
Other comprehensive income (loss), net of tax		(103)				(103)
Share-based payment activity (in shares)			12,422
Share-based payment activity		9,595		8,999			596
Dividends declared		(13,242)							(13,242)
Treasury purchases (in shares)			(2,422)
Treasury purchases		(338)					(338)
Ending balance (in shares) at Jun. 30, 2022			55,780,322
Ending balance at Jun. 30, 2022		416,725	$ 951	274,384		(4,811)	(1,276,090)		1,422,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		103,080							103,080
Other comprehensive income (loss), net of tax		(902)				(902)
Share-based payment activity (in shares)			(1,655)
Share-based payment activity		9,763		9,708			55
Dividends declared		(12,767)							(12,767)
Treasury purchases (in shares)			(2,005,000)
Treasury purchases		$ (231,388)					(231,388)
Ending balance (in shares) at Sep. 30, 2022		53,773,667	53,773,667
Ending balance at Sep. 30, 2022		$ 284,511	$ 951	$ 284,092		$ (5,713)	$ (1,507,423)		$ 1,512,604

[1] In April 2020, in light of uncertainty resulting from the COVID-19 pandemic, the Company suspended future, undeclared dividends. In May 2021, the Company resumed the payment of quarterly dividends, subject to future declarations by the Company's board of directors, and declared a quarterly cash dividend of $0.225 per share of common stock. On December 6, 2021, the Company's board of directors approved a 6% increase in the quarterly cash dividend and declared a quarterly cash dividend of $0.2375 per share of common stock. During certain periods presented, accumulated dividends were paid to certain shareholders upon vesting of performance vested restricted stock units ("PVRSU") which are captured in Share-based payment activity.