Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real estate investments at cost:
Net real estate investments	$ 10,196,730
Cash and cash equivalents	36,855	$ 13,256
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $9,577 and $9,021 at March 31, 2017 and December 31, 2016, respectively	0
Notes receivable	10,992	10,481
Other assets	939,242
Total assets	11,135,972
Liabilities:
Notes payable	2,749,202	1,363,925
Unsecured credit facilities	658,024	278,495
Total liabilities	4,371,469
Noncontrolling interests:
Stockholders' Equity Attributable to Noncontrolling Interest	33,154
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,764,503)	(2,624,502)
Total liabilities and equity	11,135,972
Parent Company [Member]
Real estate investments at cost:
Land	4,760,963	1,660,424
Buildings and improvements	5,908,653	3,092,197
Properties in development	292,480	180,878
Gross real estate investments at cost	10,962,096	4,933,499
Less: accumulated depreciation	1,166,657	1,124,391
Total Cost Net of Accumulated Depreciation	9,795,439	3,809,108
Properties held for sale	19,600	0
Investments in real estate partnerships	381,691	296,699
Net real estate investments	10,196,730	4,105,807
Cash and cash equivalents	36,855	13,256
Restricted cash	7,987	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $9,577 and $9,021 at March 31, 2017 and December 31, 2016, respectively	119,843	111,722
Deferred Costs, Leasing, Net	68,299	69,000
Acquired lease intangible assets, less accumulated amortization of $69,324 and $56,695 at March 31, 2017 and December 31, 2016, respectively	606,707	118,831
Trading securities held in trust	29,025	28,588
Other assets	70,526	37,079
Total assets	11,135,972	4,488,906
Liabilities:
Notes payable	2,749,202	1,363,925
Unsecured credit facilities	658,024	278,495
Accounts payable and other liabilities	242,638	138,936
Acquired lease intangible liabilities, less accumulated amortization of $28,689 and $23,538 at March 31, 2017 and December 31, 2016, respectively	680,469	54,180
Tenants’ security, escrow deposits and prepaid rent	41,136	28,868
Total liabilities	4,371,469	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 March 31, 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; 170,076,671 and 104,497,286 shares issued at March 31, 2017 and December 31, 2016, respectively	1,701	1,045
Treasury stock at cost, 349,660 and 347,903 shares held at March 31, 2017 and December 31, 2016, respectively	(17,473)	(17,062)
Additional paid in capital	7,768,794	3,294,923
Accumulated other comprehensive loss	(15,791)	(18,346)
Distributions in excess of net income	(1,080,882)	(994,259)
Total stockholders’ equity	6,731,349	2,591,301
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $10,235 and $10,630 at March 31, 2017 and December 31, 2016, respectively	(2,063)	(1,967)
Limited partners’ interests in consolidated partnerships	35,217	35,168
Stockholders' Equity Attributable to Noncontrolling Interest	33,154	33,201
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,764,503)	(2,624,502)
Total liabilities and equity	11,135,972	4,488,906
Partnership Interest [Member]
Real estate investments at cost:
Land	4,760,963	1,660,424
Buildings and improvements	5,908,653	3,092,197
Properties in development	292,480	180,878
Gross real estate investments at cost	10,962,096	4,933,499
Less: accumulated depreciation	1,166,657	1,124,391
Total Cost Net of Accumulated Depreciation	9,795,439	3,809,108
Properties held for sale	19,600	0
Investments in real estate partnerships	381,691	296,699
Net real estate investments	10,196,730	4,105,807
Cash and cash equivalents	36,855	13,256
Restricted cash	7,987	4,623
Tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of $9,577 and $9,021 at March 31, 2017 and December 31, 2016, respectively	119,843	111,722
Deferred Costs, Leasing, Net	68,299	69,000
Acquired lease intangible assets, less accumulated amortization of $69,324 and $56,695 at March 31, 2017 and December 31, 2016, respectively	606,707	118,831
Trading securities held in trust	29,025	28,588
Other assets	70,526	37,079
Total assets	11,135,972	4,488,906
Liabilities:
Notes payable	2,749,202	1,363,925
Unsecured credit facilities	658,024	278,495
Accounts payable and other liabilities	242,638	138,936
Acquired lease intangible liabilities, less accumulated amortization of $28,689 and $23,538 at March 31, 2017 and December 31, 2016, respectively	680,469	54,180
Tenants’ security, escrow deposits and prepaid rent	41,136	28,868
Total liabilities	4,371,469	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 March 31, 2017 and December 31, 2016, liquidation preference of $25 per unit	75,000	325,000
General partner; 170,076,671 and 104,497,286 units outstanding at March 31, 2017 and December 31, 2016, respectively	6,672,140	2,284,647
Limited partners; 154,170 units outstanding at March 31, 2017 and December 31, 2016	(2,063)	(1,967)
Accumulated other comprehensive loss	(15,791)	(18,346)
Total partners’ capital	6,729,286	2,589,334
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	35,217	35,168
Total noncontrolling interests	35,217	35,168
Total equity	6,764,503	2,624,502
Total liabilities and equity	11,135,972	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	17,473	17,062
Additional Paid-in Capital [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,768,794)	(3,294,923)
AOCI Attributable to Parent [Member]
Stockholders’ equity/Partners' capital:
Accumulated other comprehensive loss	(15,792)	(18,346)
AOCI Attributable to Parent [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	15,791	18,346
Accumulated Distributions in Excess of Net Income [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,080,882	994,259
Total Stockholders' Equity [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,731,349)	(2,591,301)
Noncontrolling Interest Exchangeable Operating Partnership Units [Member] | Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,063	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	$ (35,217)	$ (35,168)