CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2014	$ 204,096	$ 308	$ 137,769	$ (148,465)	$ 3	$ 214,481
Balance (shares) at Dec. 31, 2014		30,758
Purchase of treasury stock, at cost	(59,293)	$ 0	0	(59,293)	0	0
Exercise of stock options	374	0	(3)	377	0	0
Income tax benefit from stock-based compensation, net	2,338	0	2,338	0	0	0
Stock-based compensation expense	10,174	0	3,456	6,718	0	0
Other	1,011	0	391	620	0	0
Dividends paid	(15,812)	0	0	0	0	(15,812)
Unrealized gain on marketable securities, net of tax	2	0	0	0	2	0
Net income	33,051	0	0	0	0	33,051
Balance at Sep. 30, 2015	$ 175,941	$ 308	$ 143,951	$ (200,043)	$ 5	$ 231,720
Balance (shares) at Sep. 30, 2015		30,758