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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Components of Long-term debt    
Long-term debt $ 397,481 $ 399,143
Debt Issuance Cost (2,987) (3,325)
Long-term Debt, Net of Debt Issuance Cost 389,513 391,175
Current portion of long-term debt 6,656 6,656
Long-term debt (less current portion) 390,825 392,487
Fair value of long-term debt [1] 399,241 396,576
Unsecured subordinated notes payable    
Components of Long-term debt    
Long-term debt 7,968 7,968
Variable rate credit facility    
Components of Long-term debt    
Long-term debt 0 0
Term loan    
Components of Long-term debt    
Long-term debt $ 392,500 $ 394,500
[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.