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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Components of Long-term debt    
Total outstanding principal $ 695,500 $ 696,250
Less: Debt issuance costs (7,183) (7,486)
Less: Current portion (3,000) (3,000)
Long-term debt (less current portion) 685,317 685,764
Fair value of long-term debt [1] 669,387 662,844
Senior unsecured notes    
Components of Long-term debt    
Total outstanding principal 400,000 400,000
Term Loan B, Maturing 2024    
Components of Long-term debt    
Total outstanding principal $ 295,500 $ 296,250
[1] Fair value of the Senior Notes is estimated based on quoted private market transactions and are classified as Level 1 in the fair value hierarchy. The fair value of the term loan B is based on observable estimates provided by third party financial professionals, and as such, is classified within Level 2 of the fair value hierarchy.