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Notes Payable (Term Loan) (Details) - Term Loan
9 Months Ended
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Unsecured term loan $ 250,000,000
LIBOR  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 1.20%
LIBOR | Minimum  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 1.20%
LIBOR | Maximum  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 1.70%
Federal Funds Rate  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 0.50%
One-month LIBOR  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 1.00%
Base Rate | Minimum  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 0.00%
Base Rate | Maximum  
Debt Instrument [Line Items]  
Basis spread on variable rate (percent) 0.75%