Consolidated Balance Sheets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Document Fiscal Year Focus	2018
Assets
Acquired lease intangible assets, less accumulated amortization of $219,689 and $148,280 at December 31, 2018 and 2017, respectively (note 6)	$ 387,069	$ 478,826
Liabilities:
Notes payable (note 8)	3,006,478	2,971,715
Unsecured Debt	708,734	623,262
Parent Company [Member]
Real Estate Investment Property, at Cost	10,863,162	10,892,821
Assets
Less: accumulated depreciation	1,535,444	1,339,771
Total Cost Net of Accumulated Depreciation	9,327,718	9,553,050
Equity Method Investments	463,001	386,304
Real Estate Held-for-sale	60,516	0
Cash and cash equivalents	42,532	45,370
Restricted cash	2,658	4,011
Accounts and Notes Receivable, Net	172,359	170,985
Deferred Costs, Leasing, Net	84,983	80,044
Acquired lease intangible assets, less accumulated amortization of $219,689 and $148,280 at December 31, 2018 and 2017, respectively (note 6)	387,069	478,826
Other assets (note 5)	403,827	427,127
Total assets	10,944,663	11,145,717
Liabilities:
Notes payable (note 8)	3,006,478	2,971,715
Unsecured Debt	708,734	623,262
Accounts payable and other liabilities	224,807	234,272
Acquired lease intangible liabilities, less accumulated amortization of $92,746 and $56,550 at December 31, 2018 and 2017, respectively (note 6)	496,726	537,401
Tenants’ security, escrow deposits and prepaid rent	57,750	46,013
Total liabilities	4,494,495	4,412,663
Commitments and contingencies (notes 15 and 16)	0	0
Stockholders’ equity (note 11):
Common stock $0.01 par value per share, 220,000,000 shares authorized; 167,904,593 and 171,364,908 shares issued at December 31, 2018 and 2017, respectively	1,679	1,714
Treasury Stock, Value	19,834	18,307
Additional paid-in capital	7,672,517	7,873,104
Accumulated other comprehensive loss	(927)	(6,289)
Distributions in excess of net income	(1,255,465)	(1,158,170)
Total stockholders’ equity	6,397,970	6,692,052
Noncontrolling interests (note 11):
Noncontrolling Interest in Operating Partnerships	10,666	10,907
Limited partners’ interests in consolidated partnerships	41,532	30,095
Total noncontrolling interests	52,198	41,002
Total equity	6,450,168	6,733,054
Total liabilities and equity	10,944,663	11,145,717
Partnership Interest [Member]
Real Estate Investment Property, at Cost	10,863,162	10,892,821
Assets
Less: accumulated depreciation	1,535,444	1,339,771
Total Cost Net of Accumulated Depreciation	9,327,718	9,553,050
Equity Method Investments	463,001	386,304
Real Estate Held-for-sale	60,516	0
Cash and cash equivalents	42,532	45,370
Restricted cash	2,658	4,011
Accounts and Notes Receivable, Net	172,359	170,985
Deferred Costs, Leasing, Net	84,983	80,044
Acquired lease intangible assets, less accumulated amortization of $219,689 and $148,280 at December 31, 2018 and 2017, respectively (note 6)	387,069	478,826
Other assets (note 5)	403,827	427,127
Total assets	10,944,663	11,145,717
Liabilities:
Notes payable (note 8)	3,006,478	2,971,715
Unsecured Debt	708,734	623,262
Accounts payable and other liabilities	224,807	234,272
Acquired lease intangible liabilities, less accumulated amortization of $92,746 and $56,550 at December 31, 2018 and 2017, respectively (note 6)	496,726	537,401
Tenants’ security, escrow deposits and prepaid rent	57,750	46,013
Total liabilities	4,494,495	4,412,663
Commitments and contingencies (notes 15 and 16)	0	0
Stockholders’ equity (note 11):
General partner; 167,904,593 and 171,364,908 units outstanding at December 31, 2018 and 2017, respectively	6,398,897	6,698,341
Limited Partners' Capital Account	10,666	10,907
Accumulated other comprehensive loss	(927)	(6,289)
Total partners’ capital	6,408,636	6,702,959
Noncontrolling interests (note 11):
Limited partners’ interests in consolidated partnerships	41,532	30,095
Total noncontrolling interests	41,532	30,095
Total equity	6,450,168	6,733,054
Total liabilities and equity	$ 10,944,663	$ 11,145,717