Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	$ 11,142,239	$ 10,863,162
Less: accumulated depreciation	1,723,963	1,535,444
Real estate investments, net	9,418,276	9,327,718
Investments in real estate partnerships	472,863	463,001
Properties held for sale	35,563	60,516
Cash, cash equivalents and restricted cash (including $4,178 and $2,658 of restricted cash at September 30, 2019 and December 31, 2018, respectively)	47,461	45,190
Tenant and other receivables	161,381	172,359
Deferred leasing costs, less accumulated amortization of $107,737 and $101,093 at September 30, 2019 and December 31, 2018, respectively	79,729	84,983
Acquired lease intangible assets, less accumulated amortization of $247,639 and $219,689 at September 30, 2019 and December 31, 2018, respectively	264,681	387,069
Right of use assets, net	294,051	0
Other assets	398,945	403,827
Total assets	11,172,950	10,944,663
Liabilities:
Notes payable	3,437,959	3,006,478
Unsecured credit facilities	449,309	708,734
Accounts payable and other liabilities	219,529	224,807
Acquired lease intangible liabilities, less accumulated amortization of $119,539 and $92,746 at September 30, 2019 and December 31, 2018, respectively	449,498	496,726
Lease liabilities	223,581	0
Tenants’ security, escrow deposits and prepaid rent	53,227	57,750
Total liabilities	4,833,103	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; 167,562,379 and 167,904,593 shares issued at September 30, 2019 and December 31, 2018, respectively	1,676	1,679
Treasury stock at cost, 435,297 and 390,163 shares held at September 30, 2019 and December 31, 2018, respectively	(22,858)	(19,834)
Additional paid-in-capital	7,650,056	7,672,517
Accumulated other comprehensive (loss)	(15,804)	(927)
Distributions in excess of net income	(1,350,331)	(1,255,465)
Total stockholders’ equity	6,262,739	6,397,970
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $51,870 and $20,532 at September 30, 2019 and December 31, 2018, respectively	36,341	10,666
Limited partners’ interests in consolidated partnerships	40,767	41,532
Total noncontrolling interests	77,108	52,198
Total equity	6,339,847	6,450,168
Total liabilities and equity	11,172,950	10,944,663
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	11,142,239	10,863,162
Less: accumulated depreciation	1,723,963	1,535,444
Real estate investments, net	9,418,276	9,327,718
Investments in real estate partnerships	472,863	463,001
Properties held for sale	35,563	60,516
Cash, cash equivalents and restricted cash (including $4,178 and $2,658 of restricted cash at September 30, 2019 and December 31, 2018, respectively)	47,461	45,190
Tenant and other receivables	161,381	172,359
Deferred leasing costs, less accumulated amortization of $107,737 and $101,093 at September 30, 2019 and December 31, 2018, respectively	79,729	84,983
Acquired lease intangible assets, less accumulated amortization of $247,639 and $219,689 at September 30, 2019 and December 31, 2018, respectively	264,681	387,069
Right of use assets, net	294,051	0
Other assets	398,945	403,827
Total assets	11,172,950	10,944,663
Liabilities:
Notes payable	3,437,959	3,006,478
Unsecured credit facilities	449,309	708,734
Accounts payable and other liabilities	219,529	224,807
Acquired lease intangible liabilities, less accumulated amortization of $119,539 and $92,746 at September 30, 2019 and December 31, 2018, respectively	449,498	496,726
Lease liabilities	223,581	0
Tenants’ security, escrow deposits and prepaid rent	53,227	57,750
Total liabilities	4,833,103	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	6,278,543	6,398,897
Limited partners; 349,902 units outstanding at March 31, 2019 and December 31, 2018	36,341	10,666
Accumulated other comprehensive (loss)	(15,804)	(927)
Total partners’ capital	6,299,080	6,408,636
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	40,767	41,532
Total capital	6,339,847	6,450,168
Total liabilities and equity	$ 11,172,950	$ 10,944,663