Consolidated Statements of Shareholders' Deficit - 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, 2016		56,299,949
Beginning balance at Dec. 31, 2016	$ (365,282)	$ 951	$ 159,045	$ (8,522)	$ (1,070,383)	$ 553,627
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,327					122,327
Other comprehensive income	3,823			3,823
Share based payment activity (in shares)		538,069
Share based payment activity	39,020		23,403		15,617
Dividends declared	(48,682)					(48,682)
Treasury purchases (in shares)		(158,050)
Treasury purchases	(9,807)				(9,807)
Ending balance, (in shares) at Dec. 31, 2017		56,679,968
Ending balance at Dec. 31, 2017	(258,601)	$ 951	182,448	(4,699)	(1,064,573)	627,272
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	216,355					216,355
Other comprehensive income	(747)			(747)
Share based payment activity (in shares)		918,397
Share based payment activity	56,349		30,722		25,627
Dividends declared	(48,449)					(48,449)
Treasury purchases (in shares)		(1,919,158)
Treasury purchases	$ (148,679)				(148,679)
Ending balance, (in shares) at Dec. 31, 2018	55,679,207	55,679,207
Ending balance at Dec. 31, 2018	$ (183,772)	$ 951	213,170	(5,446)	(1,187,625)	795,178
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	222,878					222,878
Other comprehensive income	896			896
Share based payment activity (in shares)		654,694
Share based payment activity	38,056		19,698		18,358
Dividends declared	(48,609)					(48,609)
Treasury purchases (in shares)		(631,273)
Treasury purchases	(50,638)				(50,638)
Other(1)	$ (2,322)		(1,708)			(614)
Ending balance, (in shares) at Dec. 31, 2019	55,702,628	55,702,628
Ending balance at Dec. 31, 2019	$ (23,511)	$ 951	$ 231,160	$ (4,550)	$ (1,219,905)	$ 968,833