Consolidated Statements of Stockholders' Equity (Deficit) (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2015		76,276
Beginning balance at Dec. 31, 2015	$ 468,561	$ 114	$ (1,496,180)	$ 916,128	$ 1,058,148	$ (9,649)
Increase (Decrease) in Stockholders' Equity
Comprehensive income	53,740				50,815	2,925
Purchase of treasury stock (in shares)		(7,599)
Purchase of treasury stock	(218,941)		(218,941)
Dividends declared	(14,413)				(14,413)
Exercise of stock options (in shares)		20
Exercise of stock options	292	$ 0		292
Restricted stock awards (in shares)		16
Restricted stock awards	0
Minimum tax withholding requirements (in shares)		(19)
Minimum tax withholding requirements	(519)			(519)
Net excess tax benefits from stock-based compensation	(315)			(315)
Stock-based compensation	1,419			1,419
Ending balance (in shares) at Mar. 31, 2016		68,694
Ending balance at Mar. 31, 2016	289,824	$ 114	(1,715,121)	917,005	1,094,550	(6,724)
Beginning balance (in shares) at Dec. 31, 2016		68,399
Beginning balance at Dec. 31, 2016	(95,047)	$ 114	(1,725,349)	922,687	716,198	(8,697)
Increase (Decrease) in Stockholders' Equity
Comprehensive income	24,402				23,850	552
Dividend forfeitures on restricted stock	242				242
Restricted stock awards (in shares)		29
Restricted stock awards	0
Minimum tax withholding requirements (in shares)		(31)
Minimum tax withholding requirements	(229)			(229)
Stock-based compensation	1,410			1,410
Ending balance (in shares) at Mar. 31, 2017		68,397
Ending balance at Mar. 31, 2017	$ (69,222)	$ 114	$ (1,725,349)	$ 923,868	$ 740,290	$ (8,145)