Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of interest rates swaps designated as cash flow hedges (Details 11)

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Fair Value Measurements and Derivatives - Effects of interest rates swaps designated as cash flow hedges (Details 11) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other income (expense), net - ineffective portion   $ (30,700) $ (6,900)
Designated as Hedging Instrument | Cash Flow Hedging | Interest rates swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other comprehensive income (loss) - effective portion $ (1,701) (5,152) (5,386)
Loss recognized in other income (expense), net - ineffective portion 3 (23)
Amount reclassified from accumulated comprehensive income (loss) into depreciation and amortization expense $ 3,946 $ 4,614 $ 2,385