CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2015	$ 172,455	$ 308	$ 144,701	$ (205,325)	$ 232,771
Purchase of treasury stock, at cost	(13,913)	0	0	(13,913)	0
Repurchase of common stock	(144,263)	(31)	(144,232)	0	0
Stock-based compensation expense	12,527	0	6,153	6,374	0
Stock Issued During Period, Value, Stock Options Exercised	598	0	(27)	625	0
Other	1,029	0	452	577	0
Dividends paid	(15,324)	0	0	0	(15,324)
Net income	56,471	0	0	0	56,471
Balance at Sep. 30, 2016	$ 69,580	$ 277	$ 7,047	$ (211,662)	$ 273,918
Balance (shares) at Dec. 31, 2015		30,758
Repurchase of common stock (shares)		(3,014)
Dividends paid (shares)	0
Balance (shares) at Sep. 30, 2016		27,744