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Financial Instruments - Derivatives and Hedging (Details 1) - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 0 $ 0
Gross derivative liabilities (6,255) (4,423)
Net derivative liability $ (6,255) $ (4,423)