Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of interest rate swaps which were not designated as hedging instruments (Details 12)

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Fair Value Measurements and Derivatives - Effects of interest rate swaps which were not designated as hedging instruments (Details 12) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Not Designated as Hedging Instrument | Interest rates swaps      
Derivative Instruments Gain Loss [Line Items]      
Loss recognized in other income (expense) $ (2) $ (3)