Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	(Accumulated Deficit) Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Common stock, shares, outstanding, beginning (in shares) at Dec. 31, 2017			17,993,000
Stockholders' equity, beginning of the period at Dec. 31, 2017	$ (215,540)		$ 250	$ 276,408	$ (69,940)		$ (105)	$ (422,153)
Treasury stock, shares, beginning (in shares) at Dec. 31, 2017								7,029,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Net (loss) income	$ 80,354				80,354
Other comprehensive gain	45						45
Purchase of common stock (in shares)			(479,000)					(479,000)
Purchase of common stock	$ (34,929)							$ (34,929)
Reissuance of treasury stock (in shares)	167,396		167,000					167,000
Reissuance of treasury stock	$ 3,928			(2,551)				$ 6,479
Net issuance of shares for stock plans (in shares)			(11,000)
Repurchase of restricted shares (in shares)			(27,000)
Repurchase of restricted shares for taxes	(1,972)			(1,972)
Stock-based compensation	10,546			10,546
Dividends declared from additional paid-in capital	(44,705)			(44,705)
Dividends on common stock					0
Common stock, shares, outstanding, ending (in shares) at Dec. 31, 2018			17,644,000
Stockholders' equity, ending of the period at Dec. 31, 2018	$ (202,273)	$ (5,030)	$ 250	237,726	10,414	$ (5,030)	(60)	$ (450,603)
Treasury stock, shares, ending (in shares) at Dec. 31, 2018								7,341,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net (loss) income	$ 104,346				104,346
Other comprehensive gain	2						2
Purchase of common stock (in shares)			(1,348,000)					(1,348,000)
Purchase of common stock	$ (111,697)							$ (111,697)
Reissuance of treasury stock (in shares)	285,302		285,000					285,000
Reissuance of treasury stock	$ 11,969		$ (1)	(520)				$ 12,490
Net issuance of shares for stock plans (in shares)			(30,000)
Repurchase of restricted shares (in shares)			(30,000)
Repurchase of restricted shares for taxes	(2,728)			(2,728)
Stock-based compensation	10,808			10,808
Dividends declared from additional paid-in capital				0
Dividends on common stock	(47,095)			982	(48,077)
Tax withheld related to settlement of restricted stock units	$ (76)			(76)
Common stock, shares, outstanding, ending (in shares) at Dec. 31, 2019	16,521,921		16,522,000
Stockholders' equity, ending of the period at Dec. 31, 2019	$ (241,774)	$ (497)	$ 249	246,192	61,653	$ (497)	(58)	$ (549,810)
Treasury stock, shares, ending (in shares) at Dec. 31, 2019	8,403,526							8,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ (103,994)				(103,994)
Other comprehensive gain	3						3
Purchase of common stock (in shares)			(460,000)					(460,000)
Purchase of common stock	$ (26,527)							$ (26,527)
Reissuance of treasury stock (in shares)	433,477		433,000					433,000
Reissuance of treasury stock	$ 20,522			1,102				$ 19,420
Net issuance of shares for stock plans (in shares)			(8,000)
Repurchase of restricted shares (in shares)			(36,000)
Repurchase of restricted shares for taxes	(2,479)			(2,479)
Stock-based compensation	12,508			12,508
Dividends declared from additional paid-in capital				0
Dividends on common stock	(12,208)			507	(12,715)
Tax withheld related to settlement of restricted stock units	$ (205)			(205)
Common stock, shares, outstanding, ending (in shares) at Dec. 31, 2020	16,452,174		16,452,000
Stockholders' equity, ending of the period at Dec. 31, 2020	$ (354,651)		$ 249	$ 257,625	$ (55,553)		$ (55)	$ (556,917)
Treasury stock, shares, ending (in shares) at Dec. 31, 2020	8,429,948							8,430,000