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Financial Instruments - Derivatives and Hedging (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Unrealized loss on interest rate hedges $ (1,529) $ (4,901)
Amortization of interest rate swaps to interest expense $ 1,486 $ 2,464