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Long-Term Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term line of credit $ 295,000  
Senior unsecured notes 295,887 $ 295,243
Total long-term debt 590,887 402,243
Debt Issuance Costs, Net 4,100 4,800
Line of Credit    
Debt Instrument [Line Items]    
Long-term line of credit 295,000 107,000
Senior Notes | 5.375% senior notes due 2024    
Debt Instrument [Line Items]    
Senior unsecured notes $ 295,887 $ 295,243