CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2011	$ 309	$ 135,871	$ (134,647)	$ 24	$ 243,650	$ 245,207
Balance (in shares) at Dec. 31, 2011	30,839
Purchase of treasury stock, at cost			(13,770)			(13,770)
Exercise of stock options		(558)	1,620			1,062
Income tax benefit from stock-based compensation, net		1,097				1,097
Stock-based compensation expense		199	7,186			7,385
Other		79	827			906
Dividends paid					(12,643)	(12,643)
Unrealized gain on marketable securities, net of tax				46		46
Net income					30,957	30,957
Balance at Sep. 30, 2012	$ 309	$ 136,688	$ (138,784)	$ 70	$ 261,964	$ 260,247
Balance (in shares) at Sep. 30, 2012	30,839