Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	$ 10,878,303	$ 10,863,162
Less: accumulated depreciation	1,656,527	1,535,444
Real estate investments, net	9,221,776	9,327,718
Investments in real estate partnerships	465,495	463,001
Properties held for sale	15,106	60,516
Cash, cash equivalents and restricted cash (including $3,582 and $2,658 of restricted cash at June 30, 2019 and December 31, 2018, respectively)	37,364	45,190
Tenant and other receivables	157,883	172,359
Deferred leasing costs, less accumulated amortization of $104,972 and $101,093 at June 30, 2019 and December 31, 2018, respectively	81,183	84,983
Acquired lease intangible assets, less accumulated amortization of $237,924 and $219,689 at June 30, 2019 and December 31, 2018, respectively	262,553	387,069
Right of use assets, net	295,084	0
Other assets	410,745	403,827
Total assets	10,947,189	10,944,663
Liabilities:
Notes payable	2,994,495	3,006,478
Unsecured credit facilities	683,970	708,734
Accounts payable and other liabilities	188,723	224,807
Acquired lease intangible liabilities, less accumulated amortization of $106,286 and $92,746 at June 30, 2019 and December 31, 2018, respectively	457,667	496,726
Lease liabilities	223,959	0
Tenants’ security, escrow deposits and prepaid rent	45,527	57,750
Total liabilities	4,594,341	4,494,495
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
Common stock, $0.01 par value per share, 220,000,000 shares authorized; 167,555,322 and 167,904,593 shares issued at June 30, 2019 and December 31, 2018, respectively	1,676	1,679
Treasury stock at cost, 430,536 and 390,163 shares held at June 30, 2019 and December 31, 2018, respectively	(22,536)	(19,834)
Additional paid-in-capital	7,645,065	7,672,517
Accumulated other comprehensive (loss)	(14,086)	(927)
Distributions in excess of net income	(1,309,278)	(1,255,465)
Total stockholders’ equity	6,300,841	6,397,970
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $23,352 and $20,532 at June 30, 2019 and December 31, 2018, respectively	10,528	10,666
Limited partners’ interests in consolidated partnerships	41,479	41,532
Total noncontrolling interests	52,007	52,198
Total equity	6,352,848	6,450,168
Total liabilities and equity	10,947,189	10,944,663
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	10,878,303	10,863,162
Less: accumulated depreciation	1,656,527	1,535,444
Real estate investments, net	9,221,776	9,327,718
Investments in real estate partnerships	465,495	463,001
Properties held for sale	15,106	60,516
Cash, cash equivalents and restricted cash (including $3,582 and $2,658 of restricted cash at June 30, 2019 and December 31, 2018, respectively)	37,364	45,190
Tenant and other receivables	157,883	172,359
Deferred leasing costs, less accumulated amortization of $104,972 and $101,093 at June 30, 2019 and December 31, 2018, respectively	81,183	84,983
Acquired lease intangible assets, less accumulated amortization of $237,924 and $219,689 at June 30, 2019 and December 31, 2018, respectively	262,553	387,069
Right of use assets, net	295,084	0
Other assets	410,745	403,827
Total assets	10,947,189	10,944,663
Liabilities:
Notes payable	2,994,495	3,006,478
Unsecured credit facilities	683,970	708,734
Accounts payable and other liabilities	188,723	224,807
Acquired lease intangible liabilities, less accumulated amortization of $106,286 and $92,746 at June 30, 2019 and December 31, 2018, respectively	457,667	496,726
Lease liabilities	223,959	0
Tenants’ security, escrow deposits and prepaid rent	45,527	57,750
Total liabilities	4,594,341	4,494,495
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
General partner; 167,517,243 and 167,904,593 units outstanding atMarch 31, 2019 and December 31, 2018, respectively	6,314,927	6,398,897
Limited partners; 349,902 units outstanding at March 31, 2019 and December 31, 2018	10,528	10,666
Accumulated other comprehensive (loss)	(14,086)	(927)
Total partners’ capital	6,311,369	6,408,636
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	41,479	41,532
Total capital	6,352,848	6,450,168
Total liabilities and equity	$ 10,947,189	$ 10,944,663