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Financial Instruments - Derivatives and Hedging (Details 1) - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 0 $ 0
Gross derivative liabilities (2,480) (2,437)
Net derivative liability $ (2,480) $ (2,437)