Consolidated Statements of Shareholders' Deficit - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in- Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
Beginning balance (in shares) at Dec. 31, 2018			55,679,207
Beginning 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		30,081					30,081
Other comprehensive income (loss)		8			8
Other	[1]	(614)					(614)
Share based payment activity (in shares)			408,545
Share based payment activity		12,920		3,214		9,706
Dividends declared ($0.215 per share)		(12,149)					(12,149)
Treasury purchases (in shares)			(414,077)
Treasury purchases		(31,951)				(31,951)
Ending balance (in shares) at Mar. 31, 2019			55,673,675
Ending balance at Mar. 31, 2019		(185,477)	$ 951	216,384	(5,438)	(1,209,870)	812,496
Beginning balance (in shares) at Dec. 31, 2018			55,679,207
Beginning 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		104,470
Other comprehensive income (loss)					(228)
Ending balance (in shares) at Jun. 30, 2019			55,696,356
Ending balance at Jun. 30, 2019		(122,660)	$ 951	222,394	(5,674)	(1,215,254)	874,923
Beginning balance (in shares) at Mar. 31, 2019			55,673,675
Beginning balance at Mar. 31, 2019		(185,477)	$ 951	216,384	(5,438)	(1,209,870)	812,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		74,389					74,389
Other comprehensive income (loss)		(236)			(236)
Share based payment activity (in shares)			151,856
Share based payment activity		11,112		6,010		5,102
Dividends declared ($0.215 per share)		(11,962)					(11,962)
Treasury purchases (in shares)			(129,175)
Treasury purchases		(10,486)				(10,486)
Ending balance (in shares) at Jun. 30, 2019			55,696,356
Ending balance at Jun. 30, 2019		$ (122,660)	$ 951	222,394	(5,674)	(1,215,254)	874,923
Beginning balance (in shares) at Dec. 31, 2019		55,702,628	55,702,628
Beginning balance at Dec. 31, 2019		$ (23,511)	$ 951	231,160	(4,550)	(1,219,905)	968,833
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019	[2]							$ (6,831)	$ (6,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		55,463					55,463
Other comprehensive income (loss)		(664)			(664)
Share based payment activity (in shares)			294,826
Share based payment activity		(1,518)		(9,607)		8,089
Dividends declared ($0.215 per share)	[3]	(12,721)					(12,721)
Treasury purchases (in shares)			(657,031)
Treasury purchases		(54,072)				(54,072)
Ending balance (in shares) at Mar. 31, 2020			55,340,423
Ending balance at Mar. 31, 2020		$ (43,854)	$ 951	221,553	(5,214)	(1,265,888)	1,004,744
Beginning balance (in shares) at Dec. 31, 2019		55,702,628	55,702,628
Beginning balance at Dec. 31, 2019		$ (23,511)	$ 951	231,160	(4,550)	(1,219,905)	968,833
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019	[2]							$ (6,831)	$ (6,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 53,022
Other comprehensive income (loss)					(477)
Treasury purchases (in shares)		(548,031)
Ending balance (in shares) at Jun. 30, 2020		55,363,595	55,363,895
Ending balance at Jun. 30, 2020		$ (42,752)	$ 951	223,719	(5,027)	(1,264,527)	1,002,132
Beginning balance (in shares) at Mar. 31, 2020			55,340,423
Beginning balance at Mar. 31, 2020		(43,854)	$ 951	221,553	(5,214)	(1,265,888)	1,004,744
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		(2,441)					(2,441)
Other comprehensive income (loss)		187			187
Share based payment activity (in shares)			29,997
Share based payment activity		3,820		2,166		1,825	(171)
Dividends declared ($0.215 per share)	[3]	$ 0					0
Treasury purchases (in shares)		0	(6,525)
Treasury purchases		$ (464)				(464)
Ending balance (in shares) at Jun. 30, 2020		55,363,595	55,363,895
Ending balance at Jun. 30, 2020		$ (42,752)	$ 951	$ 223,719	$ (5,027)	$ (1,264,527)	$ 1,002,132

[1] Impact of adoption of Financial Accounting Standards Board ("FASB") Accounting Standards Update (“ASU”) No. 2014-09, Revenue From Contracts with Customers (Topic 606) and subsequent amendments to the initial guidance ("Topic 606") related to a foreign joint venture accounted for as an equity method investment.

[2] Reflects the cumulative effect of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), which was adopted on January 1, 2020. Refer to Note 1 for additional details.

[3] During the fourth quarter of 2019, the Company's board of directors announced a 5% increase to the quarterly dividend rate to $0.225 per share from $0.215 per share, beginning with the dividend payable in the first quarter of 2020. On February 28, 2020, the Company’s board of directors declared a quarterly cash dividend of $0.225 per share of common stock. The dividend was payable on April 16, 2020 to shareholders of record on April 2, 2020. In light of uncertainty resulting from the COVID-19 pandemic, we have taken the action to suspend future, undeclared dividends for at least the remainder of 2020. In the second quarter of 2020, dividends were paid upon vesting of certain performance-based stock grants which are captured in Share based payment activity.