Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, At Cost [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balances at Dec. 31, 2011	$ 389	$ 180,538	$ (30,520)	$ 307,934	$ (4,049)	$ 454,292
Balances (in shares) at Dec. 31, 2011	36,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		2,030
Issuance of restricted stock		(209)	335
Issuance of restricted stock (in shares)	27
Exercise of stock options		(987)	1,307
Exercise of stock options (in shares)	105
Surrender of fully vested options		(483)
Income tax benefit on stock-based compensation		541
Change in cumulative translation adjustment					140	140
Net income				4,847		4,847
Balances at Jun. 30, 2012	$ 389	$ 181,430	$ (28,878)	$ 312,781	$ (3,909)	$ 461,813
Balances (in shares) at Jun. 30, 2012	36,531