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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Components of Long-term debt    
Long-term debt $ 393,185 $ 399,143
Debt issuance costs on term loan (2,648) (3,325)
Net term loan 387,873 391,175
Current portion of long-term debt 6,571 6,656
Long-term debt (less current portion) 386,614 392,487
Fair value of long-term debt [1] 395,514 396,576
Variable rate credit facility    
Components of Long-term debt    
Long-term debt 0 0
Term loan    
Components of Long-term debt    
Long-term debt 390,521 394,500
Unsecured subordinated notes payable    
Components of Long-term debt    
Long-term debt $ 5,312 $ 7,968
[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.