XML 68 R55.htm IDEA: XBRL DOCUMENT v3.7.0.1
Notes Payable, net - Unsecured Revolving Credit Facility (Details) - USD ($)
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Principal Amount $ 2,616,568,000 $ 2,707,839,000
Unsecured Debt    
Line of Credit Facility [Line Items]    
Principal Amount 1,935,000,000 2,025,000,000
Revolving Credit Facility 2014 | Unsecured Debt    
Line of Credit Facility [Line Items]    
Principal Amount 210,000,000 300,000,000
Remaining borrowing capacity 190,000,000 100,000,000
Total borrowing capacity $ 400,000,000 $ 400,000,000
Debt instrument, extension period (in years) 1 year  
Revolving Credit Facility 2014 | Unsecured Debt | Minimum    
Line of Credit Facility [Line Items]    
Facility fee-annual rate (as a percent) 0.20%  
Revolving Credit Facility 2014 | Unsecured Debt | Maximum    
Line of Credit Facility [Line Items]    
Facility fee-annual rate (as a percent) 0.35%  
Revolving Credit Facility 2014 | Unsecured Debt | LIBOR | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (as a percent) 1.15%  
Revolving Credit Facility 2014 | Unsecured Debt | LIBOR | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (as a percent) 1.85%