CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 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	(33,468)	$ 0	0	(33,468)	0	0
Exercise of stock options	374	0	(3)	377	0	0
Income tax benefit from stock-based compensation, net	2,507	0	2,507	0	0	0
Stock-based compensation expense	6,464	0	2,150	4,314	0	0
Other	683	0	258	425	0	0
Dividends paid	(10,407)	0	0	0	0	(10,407)
Unrealized loss on marketable securities, net of tax	(3)	0	0	0	(3)	0
Net income	21,101	0	0	0	0	21,101
Balance at Jun. 30, 2015	$ 191,347	$ 308	$ 142,681	$ (176,817)	$ 0	$ 225,175
Balance (shares) at Jun. 30, 2015		30,758