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Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Total debt, net of unamortized loan fees $ 728,012   $ 728,012   $ 770,242
Unamortized loan fees $ 12,558   $ 12,558   $ 14,994
Effective rate 3.63%   3.63%    
Leverage ratio threshold     2.25    
Variable interest rate     0.25%    
Cash paid for interest, net of amounts capitalized     $ 21,600 $ 25,100  
Term loan A-1          
Debt Instrument [Line Items]          
Periodic payment of principal     3,600    
Periodic payment principal, period two     7,300    
Periodic payment principal, period three     $ 10,900    
Term loan A-1 | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Variable interest rate     1.50%    
Term loan A-2          
Debt Instrument [Line Items]          
Periodic payment of principal     $ 1,200    
Additional payment to required quarterly payments $ 15,000 $ 15,000      
Term loan A-2 | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Variable interest rate     1.75%