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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Components of Long-term debt    
Total outstanding principal $ 402,656 $ 395,833
Less: Debt issuance costs (6,821) (2,648)
Less: Current portion (2,656) (6,571)
Long-term debt (less current portion) 393,179 386,614
Fair value of long-term debt [1] 412,529 395,514
Senior unsecured notes    
Components of Long-term debt    
Total outstanding principal 400,000 0
Unsecured subordinated notes    
Components of Long-term debt    
Total outstanding principal 2,656 5,312
Variable rate credit facility    
Components of Long-term debt    
Total outstanding principal 0 0
Term loan B    
Components of Long-term debt    
Total outstanding principal $ 0 $ 390,521
[1] Fair value of the Senior Notes and the term loan B were estimated based on quoted private market transactions and is classified as Level 1 in the fair value hierarchy. The fair value of the unsecured subordinated notes is determined based on a discounted cash flow analysis using current market interest rates of comparable instruments and is classified as Level 2 in the fair value hierarchy.