Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Summary of Analysis of Financial Statement Line Item Impacted by Cash Flow Hedges in Condensed Consolidated Statement of Operations (Details)

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Long-term Debt - Summary of Analysis of Financial Statement Line Item Impacted by Cash Flow Hedges in Condensed Consolidated Statement of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Disclosure [Abstract]        
Total interest expense $ 19,033 $ 15,361 $ 37,744 $ 29,144
Impact of hedging $ (143) $ 264 $ (88) $ 597