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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Loss recognized in other comprehensive income - effective portion $ (901) $ (570) $ (3,456) $ (4,159)
Gain (loss) recognized in other expense - ineffective portion (5) 3 (12)
Amount reclassified from accumulated other comprehensive income (loss) into interest expense, net $ 981 $ 1,081 $ 1,981 $ 2,018