CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2011	$ 300,577	$ 666	$ 165,712	$ 947,156	$ (813,684)	$ 727
Beginning Balance (in shares) at Dec. 31, 2011		66,602,486			19,882,289
Net income	62,702			62,702
Dividends paid ($0.11 per share)	(5,157)			(5,157)
Purchases of common stock (in shares)					315,600
Purchases of common stock	(15,752)				(15,752)
Exercises of stock options and forfeitures and vesting of non-vested stock, including excess tax effect, shares		249,186			4,773
Exercises of stock options and forfeitures and vesting of non-vested stock, including excess tax effect	2,019	3	2,023		(7)
Stock-based compensation	3,186		3,186
Foreign currency translation	(64)					(64)
Unrealized gain on available-for-sale investments, net of income taxes	248					248
Ending Balance at Jun. 30, 2012	$ 347,759	$ 669	$ 170,921	$ 1,004,701	$ (829,443)	$ 911
Ending Balance (in shares) at Jun. 30, 2012		66,851,672			20,202,662