Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details) - Designated As Hedging - Cash Flow Hedge - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap
Recurring financial liability that was measured at carrying value
Derivative liability	$ (606)	$ (768)	$ (1,020)
Realized gain (loss) on cash flow hedge	709	768
Foreign currency hedges
Recurring financial liability that was measured at carrying value
Derivative Asset	(234)	0
Realized gain (loss) on cash flow hedge	0
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap
Recurring financial liability that was measured at carrying value
Derivative liability	(606)	(768)
Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency hedges
Recurring financial liability that was measured at carrying value
Derivative Asset	(234)
Recurring | Carrying Value | Interest rate swap
Recurring financial liability that was measured at carrying value
Derivative liability	(606)	$ (768)
Recurring | Carrying Value | Foreign currency hedges
Recurring financial liability that was measured at carrying value
Derivative Asset	$ (234)