Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 366,288	$ 47,317	$ 243,258
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	303,331	345,900	374,283
Amortization of deferred loan costs and debt premiums	6,003	9,023	11,170
(Accretion) and amortization of above and below market lease intangibles, net	(22,936)	(40,540)	(43,867)
Stock-based compensation, net of capitalization	12,515	13,581	14,339
Equity in income of investments in real estate partnerships	(47,086)	(34,169)	(60,956)
Gain on sale of real estate, net of tax	(91,119)	(67,465)	(24,242)
Provision for impairment of real estate	84,389	18,536	54,174
Goodwill impairment		132,128
Early extinguishment of debt		21,837	11,982
Distribution of earnings from investments in real estate partnerships	71,934	47,703	56,297
Settlement of derivative instrument	(2,472)		(6,870)
Deferred compensation expense	4,572	4,668	5,169
Realized and unrealized (gain) loss on investments	(5,348)	(5,519)	(5,433)
Changes in assets and liabilities:
Tenant and other receivables	(24,869)	16,944	(4,690)
Deferred leasing costs	(6,966)	(6,973)	(6,777)
Other assets	(1,226)	(1,200)	(1,570)
Accounts payable and other liabilities	6,677	997	4,175
Tenants’ security, escrow deposits and prepaid rent	5,701	(3,650)	829
Net cash provided by operating activities	659,388	499,118	621,271
Cash flows from investing activities:
Acquisition of operating real estate, net of cash acquired of $2,991 in 2021	(392,051)	(16,767)	(222,569)
Real estate development and capital improvements	(177,631)	(180,804)	(200,012)
Proceeds from sale of real estate	206,193	189,444	137,572
Proceeds from property insurance casualty claims		7,957	9,350
Issuance of notes receivable, net	(20)	(1,340)	(547)
Investments in real estate partnerships	(23,476)	(51,440)	(66,921)
Return of capital from investments in real estate partnerships	99,945	32,125	63,693
Dividends on investment securities	813	353	660
Acquisition of investment securities	(23,971)	(25,155)	(23,458)
Proceeds from sale of investment securities	23,846	19,986	19,539
Net cash used in investing activities	(286,352)	(25,641)	(282,693)
Cash flows from financing activities:
Net proceeds from common stock issuance	82,510	125,608
Repurchase of common shares/units in conjunction with tax withholdings on equity award plans	(4,083)	(5,512)	(6,204)
Proceeds from sale of treasury stock/units	96	269	9
Common shares repurchased through share repurchase program			(32,778)
Distributions to limited partners in consolidated partnerships, net	(4,345)	(2,770)	(3,367)
Distributions to exchangeable operating partnership unit holders	(1,815)	(1,366)	(1,051)
Dividends paid to common stockholders/ Distributions to partners	(403,085)	(300,537)	(390,598)
Repayment of fixed rate unsecured notes		(300,000)	(250,000)
Proceeds from issuance of fixed rate unsecured notes, net		598,830	723,571
Proceeds from unsecured credit facilities		610,000	560,000
Repayments of proceeds from unsecured credit facilities, net	(265,000)	(830,000)	(785,000)
Repayment of notes payable	(42,014)	(67,189)	(55,680)
Scheduled principal payments	(11,255)	(11,104)	(9,442)
Payment of loan costs	(7,468)	(5,063)	(7,019)
Early redemption costs		(21,755)	(10,647)
Net cash used in financing activities	(656,459)	(210,589)	(268,206)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(283,423)	262,888	70,372
Cash, cash equivalents, and restricted cash at beginning of the year	378,450	115,562	45,190
Cash, cash equivalents, and restricted cash at end of the year	95,027	378,450	115,562
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $4,202, $4,355, and $4,192 in 2021, 2020, and 2019, respectively)	140,084	151,338	136,139
Cash paid for income taxes, net of refunds	378	1,870	1,225
Supplemental disclosure of non-cash transactions:
Exchangeable operating partnership units issued for acquisition of real estate		1,275	25,870
Previously held equity investments in real estate assets acquired	(4,609)	5,986
Mortgage loans assumed by Company with the acquisition of real estate	111,104	16,359	26,152
Mortgage loan assumed by purchaser with the sale of real estate		8,250
Common stock issued by Parent Company for partnership units exchanged	99
Real estate received in lieu of promote interest	13,589
Change in fair value of securities	513	315	660
Change in accrued capital expenditures	10,188	12,166	10,704
Common stock issued for dividend reinvestment plan	1,286	1,139	1,429
Stock-based compensation capitalized	666	1,119	2,325
Common stock and exchangeable operating partnership dividends declared but not paid	107,480	101,412
(Distributions to) Contributions from limited partners in consolidated partnerships, net		(1,512)	66
Common stock issued for dividend reinvestment in trust	1,084	819	987
Contribution of stock awards into trust	1,416	1,524	2,582
Distribution of stock held in trust	3,647	1,052	197
Partnership Interest [Member]
Cash flows from operating activities:
Net income	366,288	47,317	243,258
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	303,331	345,900	374,283
Amortization of deferred loan costs and debt premiums	6,003	9,023	11,170
(Accretion) and amortization of above and below market lease intangibles, net	(22,936)	(40,540)	(43,867)
Stock-based compensation, net of capitalization	12,515	13,581	14,339
Equity in income of investments in real estate partnerships	(47,086)	(34,169)	(60,956)
Gain on sale of real estate, net of tax	(91,119)	(67,465)	(24,242)
Provision for impairment of real estate	84,389	18,536	54,174
Goodwill impairment		132,128
Early extinguishment of debt		21,837	11,982
Distribution of earnings from investments in real estate partnerships	71,934	47,703	56,297
Settlement of derivative instrument	(2,472)		(6,870)
Deferred compensation expense	4,572	4,668	5,169
Realized and unrealized (gain) loss on investments	(5,348)	(5,519)	(5,433)
Changes in assets and liabilities:
Tenant and other receivables	(24,869)	16,944	(4,690)
Deferred leasing costs	(6,966)	(6,973)	(6,777)
Other assets	(1,226)	(1,200)	(1,570)
Accounts payable and other liabilities	6,677	997	4,175
Tenants’ security, escrow deposits and prepaid rent	5,701	(3,650)	829
Net cash provided by operating activities	659,388	499,118	621,271
Cash flows from investing activities:
Acquisition of operating real estate, net of cash acquired of $2,991 in 2021	(392,051)	(16,767)	(222,569)
Real estate development and capital improvements	(177,631)	(180,804)	(200,012)
Proceeds from sale of real estate	206,193	189,444	137,572
Proceeds from property insurance casualty claims		7,957	9,350
Issuance of notes receivable, net	(20)	(1,340)	(547)
Investments in real estate partnerships	(23,476)	(51,440)	(66,921)
Return of capital from investments in real estate partnerships	99,945	32,125	63,693
Dividends on investment securities	813	353	660
Acquisition of investment securities	(23,971)	(25,155)	(23,458)
Proceeds from sale of investment securities	23,846	19,986	19,539
Net cash used in investing activities	(286,352)	(25,641)	(282,693)
Cash flows from financing activities:
Net proceeds from common stock issuance	82,510	125,608
Repurchase of common shares/units in conjunction with tax withholdings on equity award plans	(4,083)	(5,512)	(6,204)
Proceeds from sale of treasury stock/units	96	269	9
Common shares repurchased through share repurchase program			(32,778)
Distributions to limited partners in consolidated partnerships, net	(4,345)	(2,770)	(3,367)
Dividends paid to common stockholders/ Distributions to partners	(404,900)	(301,903)	(391,649)
Repayment of fixed rate unsecured notes		(300,000)	(250,000)
Proceeds from issuance of fixed rate unsecured notes, net		598,830	723,571
Proceeds from unsecured credit facilities		610,000	560,000
Repayments of proceeds from unsecured credit facilities, net	(265,000)	(830,000)	(785,000)
Repayment of notes payable	(42,014)	(67,189)	(55,680)
Scheduled principal payments	(11,255)	(11,104)	(9,442)
Payment of loan costs	(7,468)	(5,063)	(7,019)
Early redemption costs		(21,755)	(10,647)
Net cash used in financing activities	(656,459)	(210,589)	(268,206)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(283,423)	262,888	70,372
Cash, cash equivalents, and restricted cash at beginning of the year	378,450	115,562	45,190
Cash, cash equivalents, and restricted cash at end of the year	95,027	378,450	115,562
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $4,202, $4,355, and $4,192 in 2021, 2020, and 2019, respectively)	140,084	151,338	136,139
Cash paid for income taxes, net of refunds	378	1,870	1,225
Supplemental disclosure of non-cash transactions:
Exchangeable operating partnership units issued for acquisition of real estate		1,275	25,870
Previously held equity investments in real estate assets acquired	(4,609)	5,986
Mortgage loans assumed by Company with the acquisition of real estate	111,104	16,359	26,152
Mortgage loan assumed by purchaser with the sale of real estate		8,250
Common stock issued by Parent Company for partnership units exchanged	99	1,275	25,870
Real estate received in lieu of promote interest	13,589
Change in fair value of securities	513	315	660
Change in accrued capital expenditures	10,188	12,166	10,704
Common stock issued for dividend reinvestment plan	1,286	1,139	1,429
Stock-based compensation capitalized	666	1,119	2,325
Common stock and exchangeable operating partnership dividends declared but not paid	107,480	101,412
(Distributions to) Contributions from limited partners in consolidated partnerships, net		(1,512)	66
Common stock issued for dividend reinvestment in trust	1,084	819	987
Contribution of stock awards into trust	1,416	1,524	2,582
Distribution of stock held in trust	$ 3,647	$ 1,052	$ 197