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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Components of Long-term debt    
Long-term debt $ 392,375 $ 393,185
Debt issuance costs on term loan B (2,479) (2,648)
Net term loan B 387,063 387,873
Current portion of long-term debt 2,656 6,571
Long-term debt (less current portion) 389,719 386,614
Fair value of long-term debt [1] 398,650 395,514
Unsecured subordinated notes payable    
Components of Long-term debt    
Long-term debt 5,312 5,312
Variable rate credit facility    
Components of Long-term debt    
Long-term debt 0 0
Term loan B    
Components of Long-term debt    
Long-term debt $ 389,542 $ 390,521
[1] * Fair value of the term loan was estimated based on quoted private market transactions and is classified as Level 1 in the fair value hierarchy. The fair value of the unsecured promissory 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.