CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY (Unaudited) (USD $) In Thousands	Common Stock Issued [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2010	$ 309	$ 135,607	$ (124,464)	$ 21	$ 228,922	$ 240,395
Balance (in shares) at Dec. 31, 2010	30,839
Purchase of treasury stock, at cost	0	0	(22,459)	0	0	(22,459)
Exercise of stock options	0	(1,012)	4,893	0	0	3,881
Income tax benefit from stock-based compensation, net	0	1,709	0	0	0	1,709
Stock-based compensation expense	0	(280)	6,735	0	0	6,455
Other	0	87	598	0	0	685
Dividends paid	0	0	0	0	(11,871)	(11,871)
Change in unrealized gain on marketable securities, net of tax:
Unrealized gain	0	0	0	31	0	31
Net income	0	0	0	0	19,626	19,626
Comprehensive income	0	0	0	0	0	19,657
Balance at Sep. 30, 2011	$ 309	$ 136,111	$ (134,697)	$ 52	$ 236,677	$ 238,452
Balance (in shares) at Sep. 30, 2011	30,839