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Debt New Credit Facility (Details)
 3 Months Ended
Feb. 06, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Line of credit facility, current borrowing capacity $ 2,500,000,000    
Line of credit facility, additional borrowing capacity 1,500,000,000    
Deferred financing costs, net   $ (9,242,000) $ 0
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit facility, current borrowing capacity $ 1,000,000,000    
Line of Credit      
Line of Credit Facility [Line Items]      
Long-term line of credit   1,500,000,000  
Long-term debt   $ 1,485,866,000  
Ratio of indebtedness to net capital   8.00  
Long-term debt maturities, repayments of principal   $ 1,500,000,000  
Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Debt instrument, number of maturity date extensions 1 year    
Long-term line of credit   0  
Line of Credit | Unsecured Debt      
Line of Credit Facility [Line Items]      
Line of credit facility, current borrowing capacity $ 1,500,000,000    
Long-term line of credit   $ 1,500,000,000  
Line of credit facility, interest rate at period end   2.78%  
Unsecured Debt      
Line of Credit Facility [Line Items]      
Deferred financing costs, net   $ (14,134,000)  
London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Debt instrument, variable rate   0.98%  
London Interbank Offered Rate (LIBOR) | Line of Credit      
Line of Credit Facility [Line Items]      
Basis spread   1.00%  
London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread   1.80%  
Federal Funds Effective Swap Rate | Line of Credit      
Line of Credit Facility [Line Items]      
Basis spread   0.50%  
Minimum | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage   0.35%  
Line of credit facility, facility fee percentage   0.125%  
Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread   1.75%  
Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Unsecured Debt      
Line of Credit Facility [Line Items]      
Basis spread   1.70%  
Minimum | Base Rate | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread   0.75%  
Minimum | Base Rate | Line of Credit | Unsecured Debt      
Line of Credit Facility [Line Items]      
Basis spread   0.70%  
Maximum | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage   0.20%  
Line of credit facility, facility fee percentage   0.30%  
Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread   2.30%  
Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Unsecured Debt      
Line of Credit Facility [Line Items]      
Basis spread   2.30%  
Maximum | Base Rate | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread   1.30%  
Maximum | Base Rate | Line of Credit | Unsecured Debt      
Line of Credit Facility [Line Items]      
Basis spread   1.30%