Derivatives (Details 6) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives not designated as hedging instruments
Interest rate contracts included in other assets, net	$ 0	$ 3
Interest rate contracts included in other long term liabilities	(3,133)	(2,071)
Total fair value of interest rate derivatives not designated as hedging instruments	(3,133)	(2,068)
Derivatives designated as hedging instruments
Interest rate contract included in other short term liabilities	(191)	0
Interest rate contract included in other long term liabilities	0	(597)
Total fair value of interest rate derivatives designated as hedging instruments	$ (191)	$ (597)