CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Comprehensive Income
Balance at Dec. 31, 2010	$ 496,912	$ 29	$ (14,001)	$ 614,705	$ (25)	$ (103,796)
Balance (in shares) at Dec. 31, 2010		28,579	(657)
Increase (Decrease) in Stockholders' Equity
Common stock issued on exercise of stock options	172			172
Common stock issued on exercise of stock options (in shares)		10
Common stock issued under employee stock purchase plan	85			85
Common stock issued under employee stock purchase plan (in shares)		3
Common stock issued on vesting of restricted stock (in shares)		19
Purchase of treasury stock	(16,571)		(16,571)
Purchase of treasury stock (in shares)			(520)
Share-based compensation	3,210			3,210
Comprehensive income:
Foreign currency translation adjustment	136				136		136
Net income	22,892					22,892	22,892
Total comprehensive income	23,028						23,028
Balance at Jun. 30, 2011	$ 506,836	$ 29	$ (30,572)	$ 618,172	$ 111	$ (80,904)
Balance (in shares) at Jun. 30, 2011		28,611	(1,177)