Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 105,987	$ 96,832	$ 302,803	$ 178,457
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			157,192	151,476
Amortization of deferred loan costs and debt premiums			2,821	3,479
(Accretion) and amortization of above and below market lease intangibles, net			(10,528)	(11,174)
Stock-based compensation, net of capitalization			8,501	5,894
Equity in income of investments in real estate partnerships	(23,842)	(435)	(36,646)	(12,101)
Gain on sale of real estate, net of tax			(106,239)	(31,479)
Provision for impairment of real estate, net of tax		135		135
Distribution of earnings from investments in real estate partnerships			29,207	36,545
Settlement of derivative instruments				(2,472)
Deferred compensation expense			(7,007)	2,856
Realized and unrealized (gain) loss on investments			8,033	(3,606)
Changes in assets and liabilities:
Tenant and other receivables			(8,252)	12,711
Deferred leasing costs			(4,263)	(4,884)
Other assets			(8,353)	(8,490)
Accounts payable and other liabilities			(172)	7,168
Tenants' security, escrow deposits and prepaid rent			660	772
Net cash provided by operating activities			327,757	325,287
Cash flows from investing activities:
Acquisition of operating real estate, net of cash acquired of $2,256 in 2022			(139,775)	500
Real estate development and capital improvements			(99,470)	(72,735)
Proceeds from sale of real estate			136,421	107,577
Issuance of notes receivable				(20)
Investments in real estate partnerships			(11,549)	(21,382)
Return of capital from investments in real estate partnerships			48,473	58,699
Dividends on investment securities			214	67
Acquisition of investment securities			(8,313)	(14,065)
Proceeds from sale of investment securities			8,737	14,393
Net cash (used in) provided by investing activities			(65,262)	73,034
Cash flows from financing activities:
Net proceeds from common stock issuance			61,284
Repurchase of common shares in conjunction with equity award plans			(6,388)	(4,017)
Common units repurchased through share repurchase program			(71,898)
Proceeds from sale of treasury stock			64	96
Contributions from (distributions to) limited partners in consolidated partnerships, net			1,234	(1,989)
Distributions to exchangeable operating partnership unit holders			(950)	(907)
Dividends paid to common stockholders			(213,868)	(201,233)
Proceeds from unsecured credit facilities			75,000
Repayment of unsecured credit facilities			(75,000)	(265,000)
Repayment of notes payable				(3,962)
Scheduled principal payments			(5,728)	(5,678)
Payment of loan costs			(82)	(7,468)
Net cash used in financing activities			(236,332)	(490,158)
Net increase (decrease) in cash and cash equivalents and restricted cash			26,163	(91,837)
Cash and cash equivalents and restricted cash at beginning of the period			95,027	378,450	$ 378,450
Cash and cash equivalents and restricted cash at end of the period	121,190	286,613	121,190	286,613	95,027
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $796 and $849 in 2022 and 2021, respectively)			70,876	70,112
Cash paid for income taxes, net of refunds			370	314
Supplemental disclosure of non-cash transactions:
Common stock and exchangeable operating partnership dividends declared but not paid			108,215	101,520
Acquisition of real estate previously held within investments in real estate partnerships			17,179
Mortgage loans assumed by Company with the acquisition of real estate			22,779
Common stock issued for partnership units exchanged			1,275	99
Accrued common stock repurchase in Accounts payable and other liabilities			3,521
Change in accrued capital expenditures			5,050	6,947
Common stock issued under dividend reinvestment plan	134	392	252	768
Stock-based compensation capitalized			373	424
Contributions from limited partners in consolidated partnerships			5,436
Common stock issued for dividend reinvestment in trust			555	552
Contribution of stock awards into trust			2,022	1,416
Distribution of stock held in trust			566	415
Change in fair value of securities			1,236	272
Partnership Interest [Member]
Cash flows from operating activities:
Net income	105,987	96,832	302,803	178,457
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			157,192	151,476
Amortization of deferred loan costs and debt premiums			2,821	3,479
(Accretion) and amortization of above and below market lease intangibles, net			(10,528)	(11,174)
Stock-based compensation, net of capitalization			8,501	5,894
Equity in income of investments in real estate partnerships	(23,842)	(435)	(36,646)	(12,101)
Gain on sale of real estate, net of tax			(106,239)	(31,479)
Provision for impairment of real estate, net of tax		135		135
Distribution of earnings from investments in real estate partnerships			29,207	36,545
Settlement of derivative instruments				(2,472)
Deferred compensation expense			(7,007)	2,856
Realized and unrealized (gain) loss on investments			8,033	(3,606)
Changes in assets and liabilities:
Tenant and other receivables			(8,252)	12,711
Deferred leasing costs			(4,263)	(4,884)
Other assets			(8,353)	(8,490)
Accounts payable and other liabilities			(172)	7,168
Tenants' security, escrow deposits and prepaid rent			660	772
Net cash provided by operating activities			327,757	325,287
Cash flows from investing activities:
Acquisition of operating real estate, net of cash acquired of $2,256 in 2022			(139,775)	500
Real estate development and capital improvements			(99,470)	(72,735)
Proceeds from sale of real estate			136,421	107,577
Issuance of notes receivable				(20)
Investments in real estate partnerships			(11,549)	(21,382)
Return of capital from investments in real estate partnerships			48,473	58,699
Dividends on investment securities			214	67
Acquisition of investment securities			(8,313)	(14,065)
Proceeds from sale of investment securities			8,737	14,393
Net cash (used in) provided by investing activities			(65,262)	73,034
Cash flows from financing activities:
Net proceeds from common stock issuance			61,284
Repurchase of common shares in conjunction with equity award plans			(6,388)	(4,017)
Common units repurchased through share repurchase program			(71,898)
Proceeds from sale of treasury stock			64	96
Contributions from (distributions to) limited partners in consolidated partnerships, net			1,234	(1,989)
Dividends paid to common stockholders			(214,818)	(202,140)
Proceeds from unsecured credit facilities			75,000
Repayment of unsecured credit facilities			(75,000)	(265,000)
Repayment of notes payable				(3,962)
Scheduled principal payments			(5,728)	(5,678)
Payment of loan costs			(82)	(7,468)
Net cash used in financing activities			(236,332)	(490,158)
Net increase (decrease) in cash and cash equivalents and restricted cash			26,163	(91,837)
Cash and cash equivalents and restricted cash at beginning of the period			95,027	378,450	378,450
Cash and cash equivalents and restricted cash at end of the period	$ 121,190	$ 286,613	121,190	286,613	$ 95,027
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $796 and $849 in 2022 and 2021, respectively)			70,876	70,112
Cash paid for income taxes, net of refunds			370	314
Supplemental disclosure of non-cash transactions:
Common stock and exchangeable operating partnership dividends declared but not paid			108,215	101,520
Acquisition of real estate previously held within investments in real estate partnerships			17,179
Mortgage loans assumed by Company with the acquisition of real estate			22,779
Common stock issued by Parent Company for partnership units exchanged			1,275	99
Accrued common stock repurchase in Accounts payable and other liabilities			3,521
Change in accrued capital expenditures			5,050	6,947
Common stock issued under dividend reinvestment plan			252	768
Stock-based compensation capitalized			373	424
Contributions from limited partners in consolidated partnerships			5,436
Common stock issued for dividend reinvestment in trust			555	552
Contribution of stock awards into trust			2,022	1,416
Distribution of stock held in trust			566	415
Change in fair value of securities			$ 1,236	$ 272