Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Components of Refinancing Expense (Details)

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Long-Term Debt - Components of Refinancing Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
Accelerated amortization of deferred financing costs   $ 4,160  
Accelerated amortization of debt discount   3,416  
Other refinancing costs   1,924  
Total refinancing expense $ 0 $ 9,500 $ 4,468