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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 264,015 $ 366,618 $ 231,022
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 511,678 497,790 490,995
(Gain) loss on sale of depreciable real estate assets (9) (80,988) 39
Gain on sale of non-depreciable real estate assets (1,024) (12,047) (4,532)
(Gain) loss on embedded derivative in preferred shares (2,562) (17,886) 2,576
Stock compensation expense 14,329 13,654 12,444
Amortization of debt issuance costs, discounts and premiums 4,960 5,778 (4,990)
Net change in operating accounts and other operating activities 32,562 8,501 6,738
Net cash provided by operating activities 823,949 781,420 734,292
Cash flows from investing activities:      
Purchases of real estate and other assets (56,965) (105,106) (129,487)
Capital improvements, development and other (426,941) (303,097) (254,715)
Distributions from real estate joint ventures 349 507 775
Contributions to affiliates (5,349) (5,391) (2,905)
Proceeds from disposition of real estate assets 4,175 174,814 19,982
Net cash used in investing activities (484,731) (238,273) (366,350)
Cash flows from financing activities:      
Proceeds from lines of credit 255,000 565,000 1,540,000
Repayments of lines of credit (255,000) (1,105,000) (1,490,000)
Net proceeds from commercial paper 102,000 70,000  
Proceeds from notes payable 447,593 1,059,289 869,630
Principal payments on notes payable (441,108) (657,619) (878,610)
Payment of deferred financing costs (4,217) (14,274) (6,060)
Distributions to noncontrolling interests (16,243) (15,939) (15,079)
Distributions paid on common shares/units (457,355) (437,743) (419,849)
Distributions paid on preferred shares/units (3,688) (3,688) (3,688)
Net change in other financing activities (1,126) 15,695 (1,480)
Net cash used in financing activities (374,144) (524,279) (405,136)
Net (decrease) increase in cash, cash equivalents and restricted cash (34,926) 18,868 (37,194)
Cash, cash equivalents and restricted cash, beginning of period 70,541 51,673 88,867
Cash, cash equivalents and restricted cash, end of period 35,615 70,541 51,673
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 25,198 20,476 34,259
Restricted cash 10,417 50,065 17,414
Cash, cash equivalents and restricted cash, end of period 35,615 70,541 51,673
Supplemental disclosure of cash flow information:      
Interest paid 165,098 169,743 184,834
Income taxes paid 2,549 2,546 2,550
Supplemental disclosure of noncash investing and financing activities:      
Conversion of OP Units to shares of common stock 502 2,366 4,443
Accrued construction in progress 19,625 9,298 8,581
Interest capitalized 6,912 2,889 2,047
Limited Partner [Member]      
Cash flows from operating activities:      
Net income 264,015 366,618 231,022
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 511,678 497,790 490,995
(Gain) loss on sale of depreciable real estate assets (9) (80,988) 39
Gain on sale of non-depreciable real estate assets (1,024) (12,047) (4,532)
(Gain) loss on embedded derivative in preferred shares (2,562) (17,886) 2,576
Stock compensation expense 14,329 13,654 12,444
Amortization of debt issuance costs, discounts and premiums 4,960 5,778 (4,990)
Net change in operating accounts and other operating activities 32,562 8,501 6,738
Net cash provided by operating activities 823,949 781,420 734,292
Cash flows from investing activities:      
Purchases of real estate and other assets (56,965) (105,106) (129,487)
Capital improvements, development and other (426,941) (303,097) (254,715)
Distributions from real estate joint ventures 349 507 775
Contributions to affiliates (5,349) (5,391) (2,905)
Proceeds from disposition of real estate assets 4,175 174,814 19,982
Net cash used in investing activities (484,731) (238,273) (366,350)
Cash flows from financing activities:      
Proceeds from lines of credit 255,000 565,000 1,540,000
Repayments of lines of credit (255,000) (1,105,000) (1,490,000)
Net proceeds from commercial paper 102,000 70,000  
Proceeds from notes payable 447,593 1,059,289 869,630
Principal payments on notes payable (441,108) (657,619) (878,610)
Payment of deferred financing costs (4,217) (14,274) (6,060)
Distributions paid on common shares/units (473,598) (453,682) (434,928)
Distributions paid on preferred shares/units (3,688) (3,688) (3,688)
Net change in other financing activities (1,126) 15,695 (1,480)
Net cash used in financing activities (374,144) (524,279) (405,136)
Net (decrease) increase in cash, cash equivalents and restricted cash (34,926) 18,868 (37,194)
Cash, cash equivalents and restricted cash, beginning of period 70,541 51,673 88,867
Cash, cash equivalents and restricted cash, end of period 35,615 70,541 51,673
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 25,198 20,476 34,259
Restricted cash 10,417 50,065 17,414
Cash, cash equivalents and restricted cash, end of period 35,615 70,541 51,673
Supplemental disclosure of cash flow information:      
Interest paid 165,098 169,743 184,834
Income taxes paid 2,549 2,546 2,550
Supplemental disclosure of noncash investing and financing activities:      
Accrued construction in progress 19,625 9,298 8,581
Interest capitalized $ 6,912 $ 2,889 $ 2,047