Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - Cash Flow Hedge - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Noncurrent Liabilities [Member]
Derivative Liability
Derivative Liability	$ 360	$ 0
Interest rate swap | Other Current Liabilities [Member]
Derivative Liability
Derivative Liability	(246)	(768)
Foreign currency hedges | Other Current Liabilities [Member]
Derivative Liability
Derivative Liability	(234)	0
Designated as Hedging Instrument [Member] | Interest rate swap
Derivative Liability
Derivative Liability	606	$ 768	$ 1,020
Designated as Hedging Instrument [Member] | Foreign currency hedges
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ 0