SCHEDULE I - Parent Company Information - Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 2,973	$ 2,577	$ (492)	$ 2,298	$ (277)	$ 979	$ 2,214	$ 4,331	$ 6,553	$ (2,229)	$ 9,692	$ 1,610	$ 7,356	$ 7,247	$ 15,626
Other comprehensive (loss) income:
Currency translation adjustment													(796)
Derivative instruments
Unrealized losses on derivative instruments															(187)
Reclassification adjustment for losses (gains) included in net income														(499)	1,485
Tax benefit related to items of other comprehensive income (loss)													275	174	(435)
Other comprehensive income (loss)													(521)	(325)	863
Total comprehensive income													6,835	6,922	16,489
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income													7,356	7,247	15,626
Other comprehensive (loss) income:
Currency translation adjustment													(796)
Derivative instruments
Unrealized losses on derivative instruments															(187)
Reclassification adjustment for losses (gains) included in net income														(499)	1,485
Tax benefit related to items of other comprehensive income (loss)													275	174	(435)
Other comprehensive income (loss) from parent													(521)	(325)	863
Total comprehensive income													$ 6,835	$ 6,922	$ 16,489