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Long-Term Debt - Real Estate Facility (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Amount outstanding $ 1,170,214 $ 1,165,865
Real Estate Facility    
Debt Instrument [Line Items]    
Amount outstanding 20,044 9,520
Line of Credit | Real Estate Facility | Secured Debt    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 21,500 $ 21,500
Interest rate (as a percent) 5.25%  
Commitment fee (as a percent) 0.50%  
Available borrowings $ 0  
Amount outstanding $ 20,300