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Mortgage and Other Indebtedness, Net (Narrative) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	May 10, 2018 debt_instrument	Mar. 31, 2018 USD ($) loan extension_option credit_line	Dec. 31, 2017	Jul. 31, 2018 USD ($)
Debt Instrument [Line Items]
Weighted-average interest rate		4.80%	4.74%
Principal maturities in 2018		$ 608,552,000
Weighted-average maturity period		4 years 1 month 5 days	4 years 4 months 24 days
Unsecured lines of credit
Debt Instrument [Line Items]
Number of unsecured term loans (loan, credit loan) | credit_line		3
Loan agreement, basis spread on variable rate		1.20%
Annual facility fee		0.25%
Unsecured lines of credit | Minimum
Debt Instrument [Line Items]
Loan agreement, basis spread on variable rate		0.875%
Annual facility fee		0.125%
Unsecured lines of credit | Maximum
Debt Instrument [Line Items]
Loan agreement, basis spread on variable rate		1.55%
Annual facility fee		0.30%
Unsecured Term Loan 2
Debt Instrument [Line Items]
Loan agreement, basis spread on variable rate		1.35%
Debt instrument, face amount		$ 350,000,000
Debt instrument, option extension term		1 year
Interest rate		3.01%
Principal maturities in 2018		$ 350,000
Unsecured term loans
Debt Instrument [Line Items]
Loan agreement, basis spread on variable rate		1.50%
Debt instrument, face amount		$ 490,000,000
Debt instrument, option extension term		1 year
Interest rate		3.16%
Number of extension options available (extension option) | extension_option		2
Principal maturities in 2018		$ 190,000
Unsecured term loans | Forecast
Debt Instrument [Line Items]
Debt instrument, face amount				$ 300,000,000
Unsecured Term Loan 3
Debt Instrument [Line Items]
Loan agreement, basis spread on variable rate		1.65%
Weighted-average interest rate		3.31%
Debt instrument, face amount		$ 45,000,000
Operating property loan
Debt Instrument [Line Items]
Principal maturities in 2018		$ 34,026,000
Number of operating property loans (loan) | loan		2
Unsecured Term Loan
Debt Instrument [Line Items]
Number of unsecured term loans (loan, credit loan) | loan		2
Principal maturities in 2018		$ 540,000
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		5.37%	5.37%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		3.20%	2.90%
Unsecured Debt
Debt Instrument [Line Items]
Number of unsecured term loans (loan, credit loan) | loan		3
Senior Notes Due 2026
Debt Instrument [Line Items]
Debt instrument, face amount		$ 625,000,000
Senior Notes Due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		5.95%	5.95%
Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, face amount		$ 300,000,000
Senior Notes Due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		4.60%	4.60%
Unsecured lines of credit | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		2.86%	2.56%
Unsecured term loans | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		3.11%	2.81%
Non-recourse loans on operating properties
Debt Instrument [Line Items]
Debt instrument, default minimum		$ 50,000,000
Non-recourse loans on operating properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		5.32%	5.33%
Non-recourse loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		3.68%	3.37%
Recourse loans on operating properties
Debt Instrument [Line Items]
Debt instrument, default minimum		$ 150,000,000
Recourse loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate		4.30%	4.00%
Principal amortization
Debt Instrument [Line Items]
Principal maturities in 2018		$ 34,526,000
Subsequent Event | Operating property loan
Debt Instrument [Line Items]
Number of instruments extended | debt_instrument	1

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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