Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Common stock, shares, outstanding, beginning (in shares) at Dec. 31, 2018			17,644,000					7,341,000
Stockholders' equity balance, beginning of the period at Dec. 31, 2018	$ (202,273)	$ (5,030)	$ 250	$ 237,726	$ 10,414	$ (5,030)	$ (60)	$ (450,603)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	76,950				76,950
Other comprehensive income	0
Purchase of Company common stock (in shares)			1,067,000					1,067,000
Purchase of Company common stock	(90,073)							$ (90,073)
Reissuance of treasury stock (in shares)			(260,000)					(260,000)
Reissuance of treasury stock	10,671		$ (1)	(736)				$ 11,408
Net issuance of shares for stock plans (in shares)			(23,000)
Repurchase of restricted shares for taxes (in shares)			(28,000)
Repurchase of restricted shares for taxes	(2,589)			(2,589)
Stock-based compensation	8,220			8,220
Dividends on common stock	(35,658)			737	(36,395)
Common stock, shares, outstanding, ending (in shares) at Sep. 30, 2019			16,786,000					8,148,000
Stockholders' equity balance, ending of the period at Sep. 30, 2019	(239,782)		$ 249	243,358	45,939		(60)	$ (529,268)
Common stock, shares, outstanding, beginning (in shares) at Dec. 31, 2018			17,644,000					7,341,000
Stockholders' equity balance, beginning of the period at Dec. 31, 2018	$ (202,273)	(5,030)	$ 250	237,726	10,414	(5,030)	(60)	$ (450,603)
Common stock, shares, outstanding, ending (in shares) at Dec. 31, 2019	16,521,921		16,522,000					8,404,000
Stockholders' equity balance, ending of the period at Dec. 31, 2019	$ (241,774)	(497)	$ 249	246,192	61,653	(497)	(58)	$ (549,810)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Common stock, shares, outstanding, beginning (in shares) at Jun. 30, 2019			17,252,000					7,697,000
Stockholders' equity balance, beginning of the period at Jun. 30, 2019	$ (215,125)		$ 249	240,555	33,832		(59)	$ (489,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	23,917				23,917
Other comprehensive income	(1)						(1)
Purchase of Company common stock (in shares)			524,000					524,000
Purchase of Company common stock	(42,717)							$ (42,717)
Reissuance of treasury stock (in shares)			(73,000)					(73,000)
Reissuance of treasury stock	3,733			582				$ 3,151
Net issuance of shares for stock plans (in shares)			(11,000)
Repurchase of restricted shares for taxes (in shares)			(4,000)
Repurchase of restricted shares for taxes	(347)			(347)
Stock-based compensation	2,326			2,326
Dividends on common stock	(11,568)			242	(11,810)
Common stock, shares, outstanding, ending (in shares) at Sep. 30, 2019			16,786,000					8,148,000
Stockholders' equity balance, ending of the period at Sep. 30, 2019	$ (239,782)		$ 249	243,358	45,939		(60)	$ (529,268)
Common stock, shares, outstanding, beginning (in shares) at Dec. 31, 2019	16,521,921		16,522,000					8,404,000
Stockholders' equity balance, beginning of the period at Dec. 31, 2019	$ (241,774)	$ (497)	$ 249	246,192	61,653	$ (497)	(58)	$ (549,810)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(102,433)				(102,433)
Other comprehensive income	2
Purchase of Company common stock (in shares)			460,000					460,000
Purchase of Company common stock	$ (26,527)							$ (26,527)
Reissuance of treasury stock (in shares)	(396,996)		(397,000)					(397,000)
Reissuance of treasury stock	$ 20,523			2,658				$ 17,865
Net issuance of shares for stock plans (in shares)			(7,000)
Repurchase of restricted shares for taxes (in shares)			(35,000)
Repurchase of restricted shares for taxes	(2,438)			(2,438)
Stock-based compensation	9,193			9,193
Dividends on common stock	(12,208)			507	(12,715)
Other	$ (205)			(205)
Common stock, shares, outstanding, ending (in shares) at Sep. 30, 2020	16,416,695		16,417,000					8,467,000
Stockholders' equity balance, ending of the period at Sep. 30, 2020	$ (356,364)		$ 249	255,907	(53,992)		(56)	$ (558,472)
Common stock, shares, outstanding, beginning (in shares) at Jun. 30, 2020			16,418,000					8,483,000
Stockholders' equity balance, beginning of the period at Jun. 30, 2020	(368,571)		$ 249	254,429	(64,010)		(58)	$ (559,181)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	10,018				10,018
Other comprehensive income	2						2
Reissuance of treasury stock (in shares)			(16,000)					(16,000)
Reissuance of treasury stock	0			(709)				$ 709
Net issuance of shares for stock plans (in shares)			(11,000)
Repurchase of restricted shares for taxes (in shares)			(6,000)
Repurchase of restricted shares for taxes	(309)			(309)
Stock-based compensation	2,523			2,523
Other	$ (27)			(27)
Common stock, shares, outstanding, ending (in shares) at Sep. 30, 2020	16,416,695		16,417,000					8,467,000
Stockholders' equity balance, ending of the period at Sep. 30, 2020	$ (356,364)		$ 249	$ 255,907	$ (53,992)		$ (56)	$ (558,472)