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Long-term Debt - Senior Secured Credit Facility and Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 19, 2017
Jan. 31, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Long-term Debt          
Loss on early extinguishment of debt       $ 23,390,000  
Senior Secured Credit Facility          
Long-term Debt          
Refinancing costs       1,700,000  
Loss on early extinguishment of debt       2,300,000  
Term loan amount outstanding       845,000,000  
Revolving credit facility          
Long-term Debt          
Term of debt 5 years        
Maximum borrowing capacity $ 700,000,000        
Available borrowing capacity       627,900,000  
Term loan amount outstanding       50,000,000  
Letters of credit outstanding       22,100,000  
Term Loan A Facility          
Long-term Debt          
Term of debt 5 years        
Maximum borrowing capacity $ 300,000,000        
Variable interest rate LIBOR        
Term loan amount outstanding       296,200,000  
Term Loan B Facility          
Long-term Debt          
Term of debt 7 years        
Maximum borrowing capacity $ 500,000,000        
Variable interest rate LIBOR        
Variable interest rate spread (as a percent) 2.50%        
Variable interest base rate floor rate (as a percent) 0.75%        
Term loan amount outstanding       498,800,000  
Senior Subordinated Notes, 5.875 Percent, Due November 2021          
Long-term Debt          
Loss on early extinguishment of debt       21,100,000  
Amount of debt extinguished     $ 300,000,000    
Principal amount         $ 300,000,000
Interest rate (as a percent)     5.875%   5.875%
Senior Unsecured Notes 5.625 Percent Due January 15, 2027          
Long-term Debt          
Principal amount $ 400,000,000     $ 400,000,000  
Interest rate (as a percent) 5.625%     5.625%  
Percentage of principal amount at which the entity may redeem notes from net proceeds raised in connection with an equity offering 105.625%        
Percentage of the aggregate principal amount of the notes originally issued which must remain outstanding at redemption under terms of the notes 60.00%        
Period from completion of equity offering, during which notes can be redeemed 180 days        
Corporate airplane loan          
Long-term Debt          
Amount of debt extinguished   $ 20,800,000      
Minimum | Term Loan A Facility          
Long-term Debt          
Variable interest rate spread (as a percent) 1.25%        
Maximum | Term Loan A Facility          
Long-term Debt          
Variable interest rate spread (as a percent) 3.00%