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Notes Payable (Credit Facility) (Details) - Credit Facility
6 Months Ended
Jun. 30, 2017
USD ($)
Line of Credit Facility [Line Items]  
Senior unsecured line of credit $ 500,000,000
Maximum borrowing capacity $ 750,000,000
Minimum fixed charge coverage ratio 1.50
Overall leverage ratio (no more than) 60.00%
Minimum shareholders' equity $ 1,000,000,000.0
Available borrowing capacity $ 405,000,000
LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 1.10%
Federal Funds Rate  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 0.50%
One-month LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 1.00%
Minimum  
Line of Credit Facility [Line Items]  
Unencumbered interest coverage ratio 2.00
Commitment fee percentage 0.15%
Minimum | LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 1.10%
Minimum | Base Rate  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 0.10%
Maximum  
Line of Credit Facility [Line Items]  
Commitment fee percentage 0.30%
Maximum | LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 1.45%
Maximum | Base Rate  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (percent) 0.45%