Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 4,188	$ 3,440
Other comprehensive (loss) income:
Foreign currency translation adjustments	(847)	927
Change in unrealized gains and losses on interest rate swaps, net of tax	116	210
Total other comprehensive (loss) income	(731)	1,137
Comprehensive income	$ 3,457	$ 4,577