CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, At Cost [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at Dec. 31, 2011	$ 454,292	$ 389	$ 180,538	$ (30,520)	$ 307,934	$ (4,049)
Balances (in shares) at Dec. 31, 2011		36,399
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Stock-based compensation expense			907
Exercise of stock options			(669)	886
Exercise of stock options (in shares)		72
Surrender of fully vested options			(228)
Income tax benefit on stock-based compensation			418
Change in cumulative translation adjustment						4,049
Net income	7,083				7,083
Total comprehensive income	11,132
Balances at Mar. 31, 2012	$ 466,738	$ 389	$ 180,966	$ (29,634)	$ 315,017
Balances (in shares) at Mar. 31, 2012		36,471