Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Real estate investments at cost:
Notes receivable	$ 13,332	$ 10,481
Liabilities:
Notes payable	2,944,995	1,363,925
Unsecured credit facilities	563,031	278,495
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(2,624,502)
Parent Company [Member]
Real estate investments at cost:
Land	4,690,171	1,660,424
Buildings and improvements	5,779,172	3,092,197
Properties in development	373,962	180,878
Gross real estate investments at cost	10,843,305	4,933,499
Less: accumulated depreciation	1,225,474	1,124,391
Total Cost Net of Accumulated Depreciation	9,617,831	3,809,108
Properties held for sale	19,600	0
Investments in real estate partnerships	376,800	296,699
Net real estate investments	10,014,231	4,105,807
Cash and cash equivalents	97,266	13,256
Restricted cash	7,435	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $10,898 and $9,021 at June 30, 2017 and December 31, 2016, respectively	125,372	111,722
Deferred Costs, Leasing, Net	70,653	69,000
Acquired lease intangible assets, less accumulated amortization of $98,447 and $56,695 at June 30, 2017 and December 31, 2016, respectively	540,119	118,831
Trading securities held in trust	29,839	28,588
Other assets	307,429	37,079
Total assets	11,192,344	4,488,906
Liabilities:
Notes payable	2,944,995	1,363,925
Unsecured credit facilities	563,031	278,495
Accounts payable and other liabilities	246,462	138,936
Acquired lease intangible liabilities, less accumulated amortization of $39,696 and $23,538 at June 30, 2017 and December 31, 2016, respectively	653,695	54,180
Tenants’ security, escrow deposits and prepaid rent	50,126	28,868
Total liabilities	4,458,309	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; 3,000,000 Series 7 shares issued and outstanding at June 30, 2017, and 13,000,000 Series 6 and 7 shares issued and outstanding at December 31, 2016, with liquidation preferences of $25 per share	75,000	325,000
Common stock, $0.01 par value per share, 220,000,000 and 150,000,000 shares authorized; 170,102,787 and 104,497,286 shares issued at June 30, 2017 and December 31, 2016, respectively	1,701	1,045
Treasury stock at cost, 359,784 and 347,903 shares held at June 30, 2017 and December 31, 2016, respectively	(18,105)	(17,062)
Additional paid in capital	7,772,791	3,294,923
Accumulated other comprehensive loss	(16,435)	(18,346)
Distributions in excess of net income	(1,122,666)	(994,259)
Total stockholders’ equity	6,692,286	2,591,301
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $21,918 and $10,630 at June 30, 2017 and December 31, 2016, respectively	10,955	(1,967)
Limited partners’ interests in consolidated partnerships	30,794	35,168
Stockholders' Equity Attributable to Noncontrolling Interest	41,749	33,201
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,734,035)	(2,624,502)
Total liabilities and equity	11,192,344	4,488,906
Partnership Interest [Member]
Real estate investments at cost:
Land	4,690,171	1,660,424
Buildings and improvements	5,779,172	3,092,197
Properties in development	373,962	180,878
Gross real estate investments at cost	10,843,305	4,933,499
Less: accumulated depreciation	1,225,474	1,124,391
Total Cost Net of Accumulated Depreciation	9,617,831	3,809,108
Properties held for sale	19,600	0
Investments in real estate partnerships	376,800	296,699
Net real estate investments	10,014,231	4,105,807
Cash and cash equivalents	97,266	13,256
Restricted cash	7,435	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $10,898 and $9,021 at June 30, 2017 and December 31, 2016, respectively	125,372	111,722
Deferred Costs, Leasing, Net	70,653	69,000
Acquired lease intangible assets, less accumulated amortization of $98,447 and $56,695 at June 30, 2017 and December 31, 2016, respectively	540,119	118,831
Trading securities held in trust	29,839	28,588
Other assets	307,429	37,079
Total assets	11,192,344	4,488,906
Liabilities:
Notes payable	2,944,995	1,363,925
Unsecured credit facilities	563,031	278,495
Accounts payable and other liabilities	246,462	138,936
Acquired lease intangible liabilities, less accumulated amortization of $39,696 and $23,538 at June 30, 2017 and December 31, 2016, respectively	653,695	54,180
Tenants’ security, escrow deposits and prepaid rent	50,126	28,868
Total liabilities	4,458,309	1,864,404
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
Preferred units of general partner, $0.01 par value per unit, 3,000,000 and 13,000,000 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively, liquidation preference of $25 per unit	75,000	325,000
General partner; 170,102,787 and 104,497,286 units outstanding at June 30, 2017 and December 31, 2016, respectively	6,633,721	2,284,647
Limited partners; 349,902 and 154,170 units outstanding at June 30, 2017 and December 31, 2016, respectively	10,955	(1,967)
Accumulated other comprehensive loss	(16,435)	(18,346)
Total partners’ capital	6,703,241	2,589,334
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	30,794	35,168
Total noncontrolling interests	30,794	35,168
Total equity	6,734,035	2,624,502
Total liabilities and equity	11,192,344	4,488,906
Preferred Stock [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(75,000)	(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	18,105	17,062
Additional Paid-in Capital [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,772,791)	(3,294,923)
AOCI Attributable to Parent [Member]
Stockholders’ equity/Partners' capital:
Accumulated other comprehensive loss	(16,435)	(18,346)
AOCI Attributable to Parent [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	16,435	18,346
Accumulated Distributions in Excess of Net Income [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,122,666	994,259
Total Stockholders' Equity [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,692,286)	(2,591,301)
Noncontrolling Interest Exchangeable Operating Partnership Units [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(10,955)	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	$ (30,794)	$ (35,168)