Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance, Value at Dec. 31, 2011	$ 316,115	$ 3,638	$ (76)	$ 179,518	$ 137,559	$ (4,524)
Beginning Balance, Issued Shares at Dec. 31, 2011	36,418,385	36,418,385
Beginning Balance, Treasury Shares at Dec. 31, 2011			(40,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,685				15,685
Cumulative translation adjustment	4,327					4,327
Comprehensive income	20,012
Vesting of restricted stock, Shares		44,267
Vesting of restricted stock, Value		4		(4)
Exercise of stock options, Shares		33,000
Exercise of stock options, Value	14	4		10
Deferred compensation and amortization related to options and restricted stock	548			548
APIC adjustment for stock options	27			27
Dividends paid	(1,464)				(1,464)
Ending Balance, Value at Mar. 31, 2012	$ 335,252	$ 3,646	$ (76)	$ 180,099	$ 151,780	$ (197)
Ending Balance, Issued Shares at Mar. 31, 2012	36,495,652	36,495,652
Ending Balance, Treasury Shares at Mar. 31, 2012			(40,509)