CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 725	$ (7,740)	$ 8,486	$ 7,140
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	(10)	45	10	(9)
Unrealized gains on interest rate cap		45		66
Foreign currency translation adjustments	(63)	19	(62)	(20)
Total other comprehensive income (loss), net of tax	(73)	109	(52)	37
Comprehensive income (loss)	$ 652	$ (7,631)	$ 8,434	$ 7,177