Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 196,816	$ 81,625
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,842	77,259
Amortization of deferred loan costs and debt premiums	1,379	2,167
(Accretion) and amortization of above and below market lease intangibles, net	(5,302)	(5,576)
Stock-based compensation, net of capitalization	4,164	2,420
Equity in income of investments in real estate partnerships	(12,804)	(11,666)
Gain on sale of real estate, net of tax	(101,948)	(11,698)
Distribution of earnings from investments in real estate partnerships	16,736	16,491
Settlement of derivative instruments		(2,472)
Deferred compensation expense	(2,256)	1,139
Realized and unrealized (gain) loss on investments	2,533	(1,354)
Changes in assets and liabilities:
Tenant and other receivables	3,396	15,760
Deferred leasing costs	(2,014)	(1,907)
Other assets	(4,724)	(9,801)
Accounts payable and other liabilities	(29,387)	(14,716)
Tenants’ security, escrow deposits and prepaid rent	(1,539)	1,691
Net cash provided by operating activities	142,892	139,362
Cash flows from investing activities:
Acquisition of operating real estate	(30,166)	500
Real estate development and capital improvements	(53,605)	(31,378)
Proceeds from sale of real estate	124,924	53,859
Issuance of notes receivable		(20)
Investments in real estate partnerships	(7,173)	(20,223)
Return of capital from investments in real estate partnerships	23,892	3,283
Dividends on investment securities	109	51
Acquisition of investment securities	(5,554)	(8,136)
Proceeds from sale of investment securities	5,927	8,834
Net provided by investing activities	58,354	6,770
Cash flows from financing activities:
Repurchase of common shares in conjunction with equity award plans	(6,246)	(3,996)
Proceeds from sale of treasury stock	63	96
Distributions to limited partners in consolidated partnerships, net	(1,070)	(785)
Distributions to exchangeable operating partnership unit holders	(475)	(453)
Dividends paid to common stockholders	(106,887)	(100,580)
Proceeds from unsecured credit facilities	40,000
Repayment of unsecured credit facilities	(40,000)	(265,000)
Repayment of notes payable		(3,962)
Scheduled principal payments	(2,846)	(3,114)
Payment of loan costs	(82)	(7,468)
Net cash used in financing activities	(117,543)	(385,262)
Net increase (decrease) in cash and cash equivalents and restricted cash	83,703	(239,130)
Cash and cash equivalents and restricted cash at beginning of the period	95,027	378,450
Cash and cash equivalents and restricted cash at end of the period	178,730	139,320
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $796 and $849 in 2022 and 2021, respectively)	44,317	44,276
Cash paid (refunded) for income taxes	165	(101)
Supplemental disclosure of non-cash transactions:
Common stock and exchangeable operating partnership dividends declared but not paid	107,445	101,500
Change in accrued capital expenditures	11,603	874
Common stock issued under dividend reinvestment plan	118	376
Stock-based compensation capitalized	199	196
Common stock issued for dividend reinvestment in trust	267	274
Contribution of stock awards into trust	1,177	571
Distribution of stock held in trust	329	415
Change in fair value of securities	754	361
Partnership Interest [Member]
Cash flows from operating activities:
Net income	196,816	81,625
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,842	77,259
Amortization of deferred loan costs and debt premiums	1,379	2,167
(Accretion) and amortization of above and below market lease intangibles, net	(5,302)	(5,576)
Stock-based compensation, net of capitalization	4,164	2,420
Equity in income of investments in real estate partnerships	(12,804)	(11,666)
Gain on sale of real estate, net of tax	(101,948)	(11,698)
Distribution of earnings from investments in real estate partnerships	16,736	16,491
Settlement of derivative instruments		(2,472)
Deferred compensation expense	(2,256)	1,139
Realized and unrealized (gain) loss on investments	2,533	(1,354)
Changes in assets and liabilities:
Tenant and other receivables	3,396	15,760
Deferred leasing costs	(2,014)	(1,907)
Other assets	(4,724)	(9,801)
Accounts payable and other liabilities	(29,387)	(14,716)
Tenants’ security, escrow deposits and prepaid rent	(1,539)	1,691
Net cash provided by operating activities	142,892	139,362
Cash flows from investing activities:
Acquisition of operating real estate	(30,166)	500
Real estate development and capital improvements	(53,605)	(31,378)
Proceeds from sale of real estate	124,924	53,859
Issuance of notes receivable		(20)
Investments in real estate partnerships	(7,173)	(20,223)
Return of capital from investments in real estate partnerships	23,892	3,283
Dividends on investment securities	109	51
Acquisition of investment securities	(5,554)	(8,136)
Proceeds from sale of investment securities	5,927	8,834
Net provided by investing activities	58,354	6,770
Cash flows from financing activities:
Repurchase of common shares in conjunction with equity award plans	(6,246)	(3,996)
Proceeds from sale of treasury stock	63	96
Distributions to limited partners in consolidated partnerships, net	(1,070)	(785)
Dividends paid to common stockholders	(107,362)	(101,033)
Proceeds from unsecured credit facilities	40,000
Repayment of unsecured credit facilities	(40,000)	(265,000)
Repayment of notes payable		(3,962)
Scheduled principal payments	(2,846)	(3,114)
Payment of loan costs	(82)	(7,468)
Net cash used in financing activities	(117,543)	(385,262)
Net increase (decrease) in cash and cash equivalents and restricted cash	83,703	(239,130)
Cash and cash equivalents and restricted cash at beginning of the period	95,027	378,450
Cash and cash equivalents and restricted cash at end of the period	178,730	139,320
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $796 and $849 in 2022 and 2021, respectively)	44,317	44,276
Cash paid (refunded) for income taxes	165	(101)
Supplemental disclosure of non-cash transactions:
Common stock and exchangeable operating partnership dividends declared but not paid	107,445	101,500
Change in accrued capital expenditures	11,603	874
Common stock issued under dividend reinvestment plan	118	376
Stock-based compensation capitalized	199	196
Common stock issued for dividend reinvestment in trust	267	274
Contribution of stock awards into trust	1,177	571
Distribution of stock held in trust	329	415
Change in fair value of securities	$ 754	$ 361