CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2017 - 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, 2016	$ 60,525	$ 277	$ 9,240	$ (227,152)	$ 278,160
Purchase of treasury stock, at cost	(25,528)	0	0	(25,528)	0
Stock-based compensation expense	9,806	0	5,746	4,060	0
Other	833	0	476	354	3
Dividends paid	(11,579)	0	0	0	(11,579)
Net income	49,646	0	0	0	49,646
Balance at Jun. 30, 2017	$ 83,703	$ 277	$ 15,462	$ (248,266)	$ 316,230
Balance (shares) at Dec. 31, 2016		27,744
Balance (shares) at Jun. 30, 2017		27,744