Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 603	$ 30,760	$ 30,518
Other comprehensive income (loss), net of reclassification adjustments:
Unrealized gain on interest rate swap contracts	1,245	0	0
Foreign currency translation adjustments	(8,034)	(1,369)	(1,532)
Other comprehensive loss	(6,789)	(1,369)	(1,532)
Comprehensive income (loss)	$ (6,186)	$ 29,391	$ 28,986