Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Interest Rates Swaps Designated as Cash Flow Hedges (Details 10)

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Fair Value Measurements and Derivatives - Effects of Interest Rates Swaps Designated as Cash Flow Hedges (Details 10) - Cash Flow Hedging - Designated as Hedging Instrument - Interest Rate Swap - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ (818) $ (2,652) $ (2,638) $ (6,811)
Gain (loss) recognized in other expense - ineffective portion (9) 3 (21)
Amount reclassified from accumulated other comprehensive income (loss) into interest expense, net $ 996 $ 1,287 $ 2,977 $ 3,305