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Borrowings (Indebtedness) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total outstanding debt $ 4,500,000 $ 4,499,700
Average interest rate (percentage) 3.60%  
Contract maturity Mar. 11, 2022  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Average interest rate (percentage) 3.80%  
Contract maturity Sep. 13, 2019  
Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 3,525,765  
Average interest rate (percentage) 3.50%  
Contract maturity Dec. 19, 2022  
Mortgages    
Debt Instrument [Line Items]    
Repayments of Debt $ 156,400  
FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 80,000  
$1 billion unsecured revolving credit faciltiy [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Average interest rate (percentage) 2.47%  
Term Loan [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 550,000  
Average interest rate (percentage) 3.00%  
Contract maturity Apr. 17, 2018  
Fixed Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 3,724,800 3,838,300
Fixed Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt 2,292,000 1,860,000
Variable Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt 790,000 650,000
Variable Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt [1] 710,000 490,000
Fair Market Value Adjustment and Debt Issuance Cost [Member]    
Debt Instrument [Line Items]    
Total outstanding debt (12,700) $ 11,400
$1 billion unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding 410,000  
Secured Debt [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt 976,292  
Variable Rate Credit Facility [Member] | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 80,000  
Average interest rate (percentage) 1.80%  
Contract maturity Dec. 01, 2018  
Fixed Rate Debt | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Mortgage Loans on Real Estate $ 882,752  
Average interest rate (percentage) 4.00%  
Contract maturity Oct. 09, 2019  
Fixed Rate Debt | Senior Notes | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 2,292,000  
Average interest rate (percentage) 4.00%  
Contract maturity Nov. 13, 2024  
Freddie Mac | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Average interest rate (percentage) 1.80%  
Freddie Mac | $1 billion unsecured revolving credit faciltiy [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 410,000  
Average interest rate (percentage) 2.50%  
Contract maturity Apr. 15, 2020  
Fair Market Value Adjustment and Debt Issuance Cost [Member] | $1 billion unsecured revolving credit facility [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 13,540  
Fair Market Value Adjustment and Debt Issuance Cost [Member] | $1 billion unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ (26,235)  
Minimum | Term Loan [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.90%  
Minimum | $1 billion unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.85%  
Maximum | Term Loan [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.75%  
Maximum | $1 billion unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.55%  
[1] Amounts are adjusted to reflect interest rate swap and cap agreements in effect at December 31, 2017, and 2016, respectively, which results in paying fixed interest payments over the terms of the interest rate swaps and on changes in interest rates above the strike rate of the cap.