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Debt - 2017 Credit Agreement (Details) - USD ($)
 1 Months Ended
Jun. 30, 2017
Jan. 19, 2017
Sep. 30, 2013
2017 Term Facility | Goldman Sachs Bank USA      
Line of Credit Facility [Line Items]      
Borrowing capacity   $ 900,000,000  
Consent fee percentage 0.15%    
2017 Term Facility | Goldman Sachs Bank USA | Credit Facility      
Line of Credit Facility [Line Items]      
Short term debt, principal amount $ 897,750,000    
Short term debt, unamortized debt issuance costs 20,707,000    
Short term debt, net carrying value 877,043,000    
Revolving Facility      
Line of Credit Facility [Line Items]      
Borrowing capacity   200,000,000.0  
Outstanding letters of credit $ 1,800,000    
Credit Facility      
Line of Credit Facility [Line Items]      
Borrowing capacity     $ 100,000,000
Credit Facility | LIBOR      
Line of Credit Facility [Line Items]      
Variable rate basis spread (as a percent)     0.0225%
Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Commitment fee on unused balance (as a percent)     0.25%
Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Commitment fee on unused balance (as a percent)     0.35%
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA      
Line of Credit Facility [Line Items]      
Borrowing capacity   $ 900,000,000  
Amortization percent per year   1.00%  
Mandatory prepayments, percent of cash proceeds from non-ordinary course sale or other disposition   100.00%  
Mandatory prepayment, covenant two   100.00%  
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA | LIBOR      
Line of Credit Facility [Line Items]      
Variable rate basis spread (as a percent)   2.75%  
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA | Base Rate      
Line of Credit Facility [Line Items]      
Variable rate basis spread (as a percent)   1.75%  
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA      
Line of Credit Facility [Line Items]      
Borrowing capacity   $ 200,000,000  
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | LIBOR      
Line of Credit Facility [Line Items]      
Variable rate basis spread (as a percent)   2.50%  
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Base Rate      
Line of Credit Facility [Line Items]      
Variable rate basis spread (as a percent)   1.50%  
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Minimum      
Line of Credit Facility [Line Items]      
Commitment fee on unused balance (as a percent)   0.25%  
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Maximum      
Line of Credit Facility [Line Items]      
Commitment fee on unused balance (as a percent)   0.375%