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	[1]	7,644		3,617		4,030	(3)
Dividends declared	[1]	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, 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	55,770,322
Ending balance at Mar. 31, 2022		$ 314,645	$ 951	$ 265,385	$ (4,708)	$ (1,276,348)	$ 1,329,365

[1] In April 2020, in light of uncertainty resulting from the COVID-19 pandemic, we suspended future, undeclared dividends. In May 2021, the Company resumed the payment of quarterly dividends, subject to future declarations by our 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. On February 24, 2022 the Company's board of directors declared a quarterly cash dividend of $0.2375 per share of common stock. During all periods presented, accumulated dividends were paid to certain shareholders upon vesting of certain performance vested restricted stock units ("PVRSU") which are captured in Share-based payment activity.