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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 $ 550,702 $ 264,015 $ 366,618
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 534,415 511,678 497,790
Gain on sale of depreciable real estate assets (220,428) (9) (80,988)
Gain on sale of non-depreciable real estate assets (811) (1,024) (12,047)
Loss (gain) on embedded derivative in preferred shares 4,560 (2,562) (17,886)
Stock compensation expense 16,665 14,329 13,654
Amortization of debt issuance costs, discounts and premiums 5,652 4,960 5,778
Gain from unconsolidated limited partnerships, net of distributions received (51,713) (4,577) (3,882)
Net change in operating accounts and other operating activities 55,925 37,139 12,383
Net cash provided by operating activities 894,967 823,949 781,420
Cash flows from investing activities:      
Purchases of real estate and other assets (46,028) (56,965) (105,106)
Capital improvements, development and other (279,635) (225,506) (190,204)
Development costs (231,642) (201,435) (112,893)
Distributions from real estate joint venture 497 349 507
Contributions to affiliates (4,669) (5,349) (5,391)
Proceeds from disposition of real estate assets 307,891 4,175 174,814
Net cash used in investing activities (253,586) (484,731) (238,273)
Cash flows from financing activities:      
Proceeds from revolving credit facility   255,000 565,000
Repayments of revolving credit facility   (255,000) (1,105,000)
Net (payments on) proceeds from commercial paper (172,000) 102,000 70,000
Proceeds from notes payable 594,423 447,593 1,059,289
Principal payments on notes payable (467,153) (441,108) (657,619)
Payment of deferred financing costs (5,940) (4,217) (14,274)
Distributions to noncontrolling interests (15,497) (16,243) (15,939)
Distributions paid on common shares/units (470,401) (457,355) (437,743)
Distributions paid on preferred shares/units (3,688) (3,688) (3,688)
Net change in other financing activities (6,142) (1,126) 15,695
Net cash used in financing activities (546,398) (374,144) (524,279)
Net increase (decrease) in cash, cash equivalents and restricted cash 94,983 (34,926) 18,868
Cash, cash equivalents and restricted cash, beginning of period 35,615 70,541 51,673
Cash, cash equivalents and restricted cash, end of period 130,598 35,615 70,541
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 54,302 25,198 20,476
Restricted cash 76,296 10,417 50,065
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Total 130,598 35,615 70,541
Supplemental disclosure of cash flow information:      
Interest paid 158,630 165,098 169,743
Income taxes paid 2,543 2,549 2,546
Supplemental disclosure of noncash investing and financing activities:      
Conversion of OP Units to shares of common stock 43,292 502 2,366
Accrued construction in progress 15,123 19,625 9,298
Interest capitalized 9,720 6,912 2,889
Limited Partner [Member]      
Cash flows from operating activities:      
Net income 550,702 264,015 366,618
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 534,415 511,678 497,790
Gain on sale of depreciable real estate assets (220,428) (9) (80,988)
Gain on sale of non-depreciable real estate assets (811) (1,024) (12,047)
Loss (gain) on embedded derivative in preferred shares 4,560 (2,562) (17,886)
Stock compensation expense 16,665 14,329 13,654
Amortization of debt issuance costs, discounts and premiums 5,652 4,960 5,778
Gain from unconsolidated limited partnerships, net of distributions received (51,713) (4,577) (3,882)
Net change in operating accounts and other operating activities 55,925 37,139 12,383
Net cash provided by operating activities 894,967 823,949 781,420
Cash flows from investing activities:      
Purchases of real estate and other assets (46,028) (56,965) (105,106)
Capital improvements, development and other (279,635) (225,506) (190,204)
Development costs (231,642) (201,435) (112,893)
Distributions from real estate joint venture 497 349 507
Contributions to affiliates (4,669) (5,349) (5,391)
Proceeds from disposition of real estate assets 307,891 4,175 174,814
Net cash used in investing activities (253,586) (484,731) (238,273)
Cash flows from financing activities:      
Proceeds from revolving credit facility   255,000 565,000
Repayments of revolving credit facility   (255,000) (1,105,000)
Net (payments on) proceeds from commercial paper (172,000) 102,000 70,000
Proceeds from notes payable 594,423 447,593 1,059,289
Principal payments on notes payable (467,153) (441,108) (657,619)
Payment of deferred financing costs (5,940) (4,217) (14,274)
Distributions paid on common shares/units (485,898) (473,598) (453,682)
Distributions paid on preferred shares/units (3,688) (3,688) (3,688)
Net change in other financing activities (6,142) (1,126) 15,695
Net cash used in financing activities (546,398) (374,144) (524,279)
Net increase (decrease) in cash, cash equivalents and restricted cash 94,983 (34,926) 18,868
Cash, cash equivalents and restricted cash, beginning of period 35,615 70,541 51,673
Cash, cash equivalents and restricted cash, end of period 130,598 35,615 70,541
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 54,302 25,198 20,476
Restricted cash 76,296 10,417 50,065
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Total 130,598 35,615 70,541
Supplemental disclosure of cash flow information:      
Interest paid 158,630 165,098 169,743
Income taxes paid 2,543 2,549 2,546
Supplemental disclosure of noncash investing and financing activities:      
Accrued construction in progress 15,123 19,625 9,298
Interest capitalized $ 9,720 $ 6,912 $ 2,889