Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Real estate investments at cost:
Notes receivable	$ 13,984	$ 10,481
Liabilities:
Notes payable	2,943,986	1,363,925
Unsecured credit facilities	578,144	278,495
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(2,624,502)
Parent Company [Member]
Real estate investments at cost:
Land	4,578,145	1,660,424
Buildings and improvements	5,834,405	3,092,197
Properties in development	433,707	180,878
Gross real estate investments at cost	10,846,257	4,933,499
Less: accumulated depreciation	1,281,510	1,124,391
Total Cost Net of Accumulated Depreciation	9,564,747	3,809,108
Properties held for sale	27,802	0
Investments in real estate partnerships	380,930	296,699
Net real estate investments	9,973,479	4,105,807
Cash and cash equivalents	23,543	13,256
Restricted cash	7,098	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $12,279 and $9,021 at September 30, 2017 and December 31, 2016, respectively	143,153	111,722
Deferred Costs, Leasing, Net	71,826	69,000
Acquired lease intangible assets, less accumulated amortization of $123,662 and $56,695 at September 30, 2017 and December 31, 2016, respectively	508,868	118,831
Other assets	390,778	65,667
Total assets	11,118,745	4,488,906
Liabilities:
Notes payable	2,943,986	1,363,925
Unsecured credit facilities	578,144	278,495
Accounts payable and other liabilities	276,363	138,936
Acquired lease intangible liabilities, less accumulated amortization of $49,968 and $23,538 at September 30, 2017 and December 31, 2016, respectively	637,217	54,180
Tenants’ security, escrow deposits and prepaid rent	46,351	28,868
Total liabilities	4,482,061	1,864,404
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
Preferred stock, $0.01 par value per share, 30,000,000 shares authorized; 13,000,000 Series 6 and 7 shares issued and outstanding at December 31, 2016, with liquidation preferences of $25 per share	0	325,000
Common stock, $0.01 par value per share, 220,000,000 and 150,000,000 shares authorized; 170,109,043 and 104,497,286 shares issued at September 30, 2017 and December 31, 2016, respectively	1,701	1,045
Treasury stock at cost, 362,764 and 347,903 shares held at September 30, 2017 and December 31, 2016, respectively	(18,048)	(17,062)
Additional paid in capital	7,779,103	3,294,923
Accumulated other comprehensive loss	(14,141)	(18,346)
Distributions in excess of net income	(1,153,153)	(994,259)
Total stockholders’ equity	6,595,462	2,591,301
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $21,708 and $10,630 at September 30, 2017 and December 31, 2016, respectively	10,906	(1,967)
Limited partners’ interests in consolidated partnerships	30,316	35,168
Stockholders' Equity Attributable to Noncontrolling Interest	41,222	33,201
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,636,684)	(2,624,502)
Total liabilities and equity	11,118,745	4,488,906
Partnership Interest [Member]
Real estate investments at cost:
Land	4,578,145	1,660,424
Buildings and improvements	5,834,405	3,092,197
Properties in development	433,707	180,878
Gross real estate investments at cost	10,846,257	4,933,499
Less: accumulated depreciation	1,281,510	1,124,391
Total Cost Net of Accumulated Depreciation	9,564,747	3,809,108
Properties held for sale	27,802	0
Investments in real estate partnerships	380,930	296,699
Net real estate investments	9,973,479	4,105,807
Cash and cash equivalents	23,543	13,256
Restricted cash	7,098	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $12,279 and $9,021 at September 30, 2017 and December 31, 2016, respectively	143,153	111,722
Deferred Costs, Leasing, Net	71,826	69,000
Acquired lease intangible assets, less accumulated amortization of $123,662 and $56,695 at September 30, 2017 and December 31, 2016, respectively	508,868	118,831
Trading securities held in trust	0	0
Other assets	390,778	65,667
Total assets	11,118,745	4,488,906
Liabilities:
Notes payable	2,943,986	1,363,925
Unsecured credit facilities	578,144	278,495
Accounts payable and other liabilities	276,363	138,936
Acquired lease intangible liabilities, less accumulated amortization of $49,968 and $23,538 at September 30, 2017 and December 31, 2016, respectively	637,217	54,180
Tenants’ security, escrow deposits and prepaid rent	46,351	28,868
Total liabilities	4,482,061	1,864,404
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
Preferred units of general partner, $0.01 par value per unit, 13,000,000 units issued and outstanding at December 31, 2016, liquidation preference of $25 per unit	0	325,000
General partner; 170,109,043 and 104,497,286 units outstanding at September 30, 2017 and December 31, 2016, respectively	6,609,603	2,284,647
Limited partners; 349,902 and 154,170 units outstanding at September 30, 2017 and December 31, 2016, respectively	10,906	(1,967)
Accumulated other comprehensive loss	(14,141)	(18,346)
Total partners’ capital	6,606,368	2,589,334
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	30,316	35,168
Total noncontrolling interests	30,316	35,168
Total equity	6,636,684	2,624,502
Total liabilities and equity	11,118,745	4,488,906
Preferred Stock [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	0	(325,000)
Common Stock [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,701)	(1,045)
Treasury Stock [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	18,048	17,062
Additional Paid-in Capital [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,779,103)	(3,294,923)
AOCI Attributable to Parent [Member]
Stockholders’ equity/Partners' capital:
Accumulated other comprehensive loss	(14,141)	(18,346)
AOCI Attributable to Parent [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	14,141	18,346
Accumulated Distributions in Excess of Net Income [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,153,153	994,259
Total Stockholders' Equity [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,595,462)	(2,591,301)
Noncontrolling Interest Exchangeable Operating Partnership Units [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(10,906)	1,967
Noncontrolling Interests in Limited Partners Interest in Consolidated Partnerships [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (30,316)	$ (35,168)