Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Summary of Derivatives Designated as Cash Flow Hedges (Details)

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Derivatives - Summary of Derivatives Designated as Cash Flow Hedges (Details) - Interest Rate Swap - Cash flow hedge - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of gain (loss) recognized in Accumulated other comprehensive income (loss) $ 3,165 $ (914) $ 21,929 $ (8,890)
Effective portion of loss reclassified from Accumulated other comprehensive income (loss) into Net loss $ (104) (1,141) $ (1,267) (4,389)
Ineffective portion of amount of loss recognized into Net loss   $ (65)   $ (157)