Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	$ 4,366	$ 548	$ 4,781	$ 13,417
Document Fiscal Year Focus			2017
Other expense (income):
Provision for impairment	0	0	$ 0	1,666
Discontinued operations, net:
Net income			29,457	94,221
Parent Company [Member]
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	4,366	548	4,781	13,417
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	104	64	85	150
Revenues:
Minimum rent	195,992	109,945	337,232	217,619
Percentage rent	1,456	453	4,362	2,156
Recoveries from tenants and other income	57,256	35,874	102,535	69,362
Management Fees Revenue	6,601	6,140	13,307	12,904
Total revenues	261,305	152,412	457,436	302,041
Operating expenses:
Depreciation and amortization	92,230	40,299	152,284	79,015
Operating and maintenance	36,105	23,709	65,868	46,394
General and administrative	16,746	16,350	34,419	32,649
Real estate taxes	28,871	16,769	50,321	32,639
Other operating expenses (note 2)	6,616	2,440	78,129	4,747
Total operating expenses	180,568	99,567	381,021	195,444
Other expense (income):
Interest expense, net	35,407	24,401	62,606	48,544
Provision for impairment	0	0	0	1,666
Gain (Loss) on Extinguishment of Debt	(12,404)	0	(12,404)	0
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments	887	602	1,984	446
Nonoperating Income (Expense)	46,924	23,799	73,026	49,764
Income from operations before equity in income of investments in real estate partnerships	33,813	29,046	3,389	56,833
Equity in income of investments in real estate partnerships	12,240	11,050	21,583	23,971
Income tax (benefit) of taxable REIT subsidiary	246		296	0
Income from operations	45,807	40,096	24,676	80,804
Discontinued operations, net:
Net income	50,173	40,644	29,457	94,221
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(576)	(504)	(1,247)	(853)
Income attributable to noncontrolling interests	(680)	(568)	(1,332)	(1,003)
Net income attributable to the Company	49,493	40,076	28,125	93,218
Preferred stock dividends and issuance costs	(1,125)	(5,266)	(12,981)	(10,531)
Net Income (Loss) Available to Common Stockholders, Basic	$ 48,368	$ 34,810	$ 15,144	$ 82,687
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.28	$ 0.36	$ 0.10	$ 0.85
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.28	$ 0.35	$ 0.10	$ 0.84
Partnership Interest [Member]
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	$ 4,366	$ 548	$ 4,781	$ 13,417
Revenues:
Minimum rent	195,992	109,945	337,232	217,619
Percentage rent	1,456	453	4,362	2,156
Recoveries from tenants and other income	57,256	35,874	102,535	69,362
Management Fees Revenue	6,601	6,140	13,307	12,904
Total revenues	261,305	152,412	457,436	302,041
Operating expenses:
Depreciation and amortization	92,230	40,299	152,284	79,015
Operating and maintenance	36,105	23,709	65,868	46,394
General and administrative	16,746	16,350	34,419	32,649
Real estate taxes	28,871	16,769	50,321	32,639
Other operating expenses (note 2)	6,616	2,440	78,129	4,747
Total operating expenses	180,568	99,567	381,021	195,444
Other expense (income):
Interest expense, net	35,407	24,401	62,606	48,544
Provision for impairment	0	0	0	1,666
Gain (Loss) on Extinguishment of Debt	(12,404)	0	(12,404)	0
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments	887	602	1,984	446
Nonoperating Income (Expense)	46,924	23,799	73,026	49,764
Income from operations before equity in income of investments in real estate partnerships	33,813	29,046	3,389	56,833
Equity in income of investments in real estate partnerships	12,240	11,050	21,583	23,971
Income tax (benefit) of taxable REIT subsidiary	246		296	0
Income from operations	45,807	40,096	24,676	80,804
Discontinued operations, net:
Net income	50,173	40,644	29,457	94,221
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(576)	(504)	(1,247)	(853)
Income attributable to noncontrolling interests	(576)	(504)	(1,247)	(853)
Net income attributable to the Company	49,597	40,140	28,210	93,368
Distributions Paid To Preferred Unit Holders	1,125	5,266	12,981	10,531
Net income attributable to common unit holders	$ 48,472	$ 34,874	$ 15,229	$ 82,837
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.28	$ 0.36	$ 0.10	$ 0.85
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.28	$ 0.35	$ 0.10	$ 0.84