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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of gain (loss) recognized in Accumulated other comprehensive income (loss) $ 5,096 $ (7,243) $ 18,764 $ (7,976)
Effective portion of loss reclassified from Accumulated other comprehensive income (loss) into Net loss $ (425) (1,466) $ (1,163) (3,248)
Ineffective portion of amount of loss recognized into Net loss   $ (110)   $ (92)