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Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2015
Long-term Debt	$ 1,872,478	$ 2,021,357
Maturities of Long-term Debt [Abstract]
2016	47,609
2017	423,076
2018	62,461
2019	275,130
2020	237,997
Beyond 5 Years	820,601
Unamortized debt discounts (premiums)	5,604
Scheduled Principal Payments [Member]
Debt Instrument [Line Items]
Long-term Debt	37,511
Maturities of Long-term Debt [Abstract]
2016	6,167
2017	5,778
2018	5,103
2019	4,130
2020	3,986
Beyond 5 Years	12,347
Unamortized debt discounts (premiums)	0
Mortgage Loan Maturities [Member]
Debt Instrument [Line Items]
Long-term Debt	473,665
Maturities of Long-term Debt [Abstract]
2016	41,442
2017	117,298
2018	57,358
2019	106,000
2020	84,011
Beyond 5 Years	58,254
Unamortized debt discounts (premiums)	9,302
Unsecured Maturities [Member]
Debt Instrument [Line Items]
Long-term Debt	1,361,302
Maturities of Long-term Debt [Abstract]
2016	0
2017	300,000
2018	0
2019	165,000
2020	150,000
Beyond 5 Years	750,000
Unamortized debt discounts (premiums)	(3,698)
Partnership Interest [Member]
Debt Instrument [Line Items]
Notes Payable	1,707,478	1,946,357
Mortgage loans assumed for the acquisition of real estate	42,799	103,187	$ 0
Proceeds from unsecured credit facilities	$ 445,000	255,000	$ 82,000
Term Loan - Unsecured [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	LIBOR plus 0.975 basis points
Debt Instrument, Maturity Date	Jun. 27, 2019
Maturities of Long-term Debt [Abstract]
Unsecured credit facilities - maximum borrowing capacity	$ 165,000
Debt Instrument, Unused Borrowing Capacity, Amount	$ 0
Line of Credit Facility, Annual Fee Description	35
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 477,022	518,993
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt	1,707,478	1,946,357
Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	34,154	29,839
Fixed Rate Unsecured Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,196,302	1,397,525
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End	Jan. 01, 2032
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.30%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	8.40%
Debt, Weighted Average Interest Rate	6.10%
Secured Debt [Member] \| Partnership Interest [Member]
Debt Instrument [Line Items]
Secured Debt, Percent Guaranteed by Parent Company	21.40%
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 800,000
Debt Instrument, Maturity Date	May 13, 2019
Line of Credit Facility, Interest Rate Description	LIBOR plus 0.925 basis points
Maturities of Long-term Debt [Abstract]
Line of Credit Facility, Remaining Borrowing Capacity	$ 794,100
Line of Credit Facility, Annual Fee Description	.0015
Line of Credit [Member] \| Line of Credit Facility - Unsecured [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	9.25%
Line of Credit Facility, Commitment Fee Percentage	0.15%
Line of Credit Facility, Maximum Increase Allowed to Borrowing Capacity	$ 1,000,000
Variable Income Interest Rate [Member] \| Construction Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	1 month LIBOR plus 150 basis points
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End	Jan. 01, 2025
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.75%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	6.00%
Debt, Weighted Average Interest Rate	4.80%
Long-term Line of Credit	$ 165,000	75,000
Maturities of Long-term Debt [Abstract]
Debt Instrument, Interest Rate, Effective Percentage	3.696%
Unsecured Debt [Member] \| General Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Unsecured Debt [Member] \| Term Loan - Unsecured [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	9.75%
Equity Method Investments [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 490,760
Maturities of Long-term Debt [Abstract]
2016	37,238
2017	23,874
2018	27,655
2019	21,618
2020	85,506
Beyond 5 Years	295,357
Unamortized debt discounts (premiums)	(488)
Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	165,000	75,000
Line of Credit [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	0	$ 0
Derivative @ 2.196% 28.1K [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 28,100