Derivatives (Details 4) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Interest rate contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative liabilities	$ (2,141)	$ (2,530)	$ (4,618)
Interest rate contracts | Hedging Instrument
Derivative [Line Items]
Derivative liabilities	0	0	(96)
Foreign currency contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	(14)	(112)	1,478
Other long term liabilities | Interest rate contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative liabilities	(2,141)	(2,530)	(4,618)
Other short term liabilities | Interest rate contracts | Hedging Instrument
Derivative [Line Items]
Derivative liabilities	0	0	(96)
Short term assets | Foreign currency contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	$ (14)	$ (112)	$ 1,478