Derivative Financial Instruments - Narratives (Details)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2012 USD ($) instrument	Jun. 24, 2012 USD ($) instrument
Foreign exchange derivative
Derivative
Derivative Asset	$ 107
Derivative Liability	73
Cash Flow Hedge | Designated As Hedging | Foreign currency forward contracts
Derivative
Foreign currency cash flow hedge gain to be reclassified during next 12 months	0
Derivative, notional amount	10,800,000
Derivative Asset	34,000	$ 0
Cash Flow Hedge | Designated As Hedging | Interest rate swap
Derivative
Derivative, notional amount				$ 25,000,000	$ 50,000,000
Number of derivative instruments held | instrument				4	4
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months	480,000
Derivative Liability	$ 480,000	$ 768,000	$ 1,020,000