Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impact of the Swap on the consolidated financial statements      
Effective portion of gain (loss) recognized in Accumulated other comprehensive income (loss) $ (3,842) $ (2,673) $ (16,041)
Effective portion of loss reclassified from Accumulated other comprehensive income (loss) into Net loss (5,424) (7,262) (7,300)
Ineffective portion of amount of gain (loss) recognized into Net loss on interest rate swaps $ 88 $ 423 $ (119)