Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from financing activities:
Dividends, Preferred Stock, Cash		$ 0
Supplemental disclosure of noncash investing and financing activities:
Marked-to-market adjustment on derivative instruments	$ 2,300
Parent Company [Member]
Cash flows from operating activities:
Consolidated net income	43,416	45,808
Adjustments to reconcile net income to net cash provided by operating activities:
Retail revenue accretion	(98)	(91)
Depreciation and amortization	130,082	75,148
Stock compensation expense	3,018	1,885
Redeemable stock issued	243	186
Amortization of debt premium	(3,147)	(2,656)
(Gain) loss from investments in real estate joint ventures	(357)	(128)
Loss on debt extinguishment	(124)	0
Derivative interest (credit) expense	(3,551)	(616)
Gain on sale of non-depreciable real estate assets	0	(1,627)
Gain on sale of depreciable real estate assets excluded from discontinued operations	73	(755)
Net casualty loss and other settlement proceeds	91	947
Changes in assets and liabilities:
Restricted cash	5,465	4,442
Other assets	175	(1,666)
Accounts payable	(1,376)	(2,300)
Accrued expenses and other	(39,121)	(19,496)
Security deposits	475	404
Net cash provided by operating activities	138,016	104,085
Cash flows from investing activities:
Net (decrease) increase in cash and cash equivalents	423	(9,375)
Purchases of real estate and other assets	(62,817)	(61,930)
Normal capital improvements	(15,850)	(16,190)
Construction capital and other improvements	(3,327)	(984)
Renovations to existing real estate assets	(7,331)	(7,692)
Development	(59,830)	(13,020)
Distributions from real estate joint ventures	221	1,418
Proceeds from disposition of real estate assets	0	32,481
(Funding) return of escrow for future acquisitions	58,259	0
Net cash (used in) provided by investing activities	(90,675)	(65,917)
Cash flows from financing activities:
Net change in credit lines	80,000	55,000
Principal payments on notes payable	(18,871)	(35,494)
Payment of deferred financing costs	0	(139)
Repurchase of common stock	(4,734)	(1,730)
Proceeds from issuances of common shares	67	90
Distributions to noncontrolling interests	(3,667)	(3,413)
Dividends paid on common shares	(98,791)	(61,857)
Dividends, Preferred Stock, Cash	(922)
Net cash used in financing activities	(46,918)	(47,543)
Cash and cash equivalents, beginning of period	33,536	37,559
Cash and cash equivalents, end of period	33,959	28,184
Supplemental disclosure of cash flow information:
Interest paid	24,785	25,114
Income Taxes Paid	10	19
Supplemental disclosure of noncash investing and financing activities:
Conversion of units to shares of common stock	167	33
Accrued construction in progress	21,810	12,307
Interest capitalized	2,020	380
Marked-to-market adjustment on derivative instruments	6,743	(1,903)
Limited Partner [Member]
Cash flows from operating activities:
Consolidated net income	43,416	45,808
Adjustments to reconcile net income to net cash provided by operating activities:
Retail revenue accretion	(98)	(91)
Depreciation and amortization	130,082	75,148
Stock compensation expense	3,018	1,885
Redeemable stock issued	243	186
Amortization of debt premium	(3,147)	(2,656)
(Gain) loss from investments in real estate joint ventures	(357)	(128)
Loss on debt extinguishment	(124)	0
Derivative interest (credit) expense	(3,551)	(616)
Gain on sale of non-depreciable real estate assets	0	(1,627)
Gain on sale of depreciable real estate assets excluded from discontinued operations	73	(755)
Net casualty loss and other settlement proceeds	91	947
Changes in assets and liabilities:
Restricted cash	5,465	4,442
Other assets	175	(1,666)
Accounts payable	(1,376)	(2,300)
Accrued expenses and other	(39,121)	(19,496)
Security deposits	475	404
Net cash provided by operating activities	138,016	104,085
Cash flows from investing activities:
Net (decrease) increase in cash and cash equivalents	423	(9,375)
Purchases of real estate and other assets	(62,817)	(61,930)
Normal capital improvements	(15,850)	(16,190)
Construction capital and other improvements	(3,327)	(984)
Renovations to existing real estate assets	(7,331)	(7,692)
Development	(59,830)	(13,020)
Distributions from real estate joint ventures	221	1,418
Proceeds from disposition of real estate assets	0	32,481
(Funding) return of escrow for future acquisitions	58,259	0
Net cash (used in) provided by investing activities	(90,675)	(65,917)
Cash flows from financing activities:
Net change in credit lines	80,000	55,000
Principal payments on notes payable	(18,871)	(35,494)
Payment of deferred financing costs	0	(139)
Repurchase of common units	(4,734)	(1,730)
Proceeds from issuances of common units	67	90
Distributions paid on common units	(102,458)	(65,270)
Dividends, Preferred Stock, Cash	(922)	0
Net cash used in financing activities	(46,918)	(47,543)
Cash and cash equivalents, beginning of period	33,536	37,559
Cash and cash equivalents, end of period	33,959	28,184
Supplemental disclosure of cash flow information:
Interest paid	24,785	25,114
Income Taxes Paid	10	19
Supplemental disclosure of noncash investing and financing activities:
Accrued construction in progress	21,810	12,307
Interest capitalized	2,020	380
Marked-to-market adjustment on derivative instruments	$ 6,743	$ (1,903)