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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands | Total | PREFERRED SHARES | COMMON SHARES, $0.01 PAR VALUE | PAID IN CAPITAL | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | DISTRIBUTIONS | OPERATING PARTNERSHIP | PARTIALLY OWNED PROPERTIES
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2019 |  | $ 37,280 | $ 3,717 | $ 8,965,577 | $ 1,386,495 | $ (77,563) |  |  |
Balance, beginning of year at Dec. 31, 2019 |  |  |  |  |  |  |  | $ 227,837 | $ 1,183
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,912 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,424 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 3,556 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 2 | 9,236 |  |  |  | 12 |
Share options |  |  |  | 1,819 |  |  |  |  |
ESPP discount |  |  |  | 626 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (395) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership | $ (169,825) |  |  | 169,825 |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 438 |  |  |  | (438) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,912 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,424 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 3,556 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 660,780 |  |  |  | 660,780 |  |  |  |
Common Share distributions |  |  |  |  | (673,019) |  |  |  |
Preferred Share distributions |  |  |  |  | (2,318) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (1,190) |  |  |  |  | (1,190) |  |  |
Losses reclassified into earnings from other comprehensive income | (17,275) |  |  |  |  | 17,275 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 1.8075 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 2 | 9,236 |  |  |  | 12 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (3,913) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 9,525 |
Net income attributable to Noncontrolling Interests | 24,624 |  |  |  |  |  |  | 24,624 | 14,113
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (25,000) | (11,343)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 131 |  |  |  |  |  |  | (131) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 438 |  |  |  | (438) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 24,624 |  |  |  |  |  |  | 24,624 | 14,113
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 417
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (25,000) | (11,343)
Balance, end of period at Sep. 30, 2020 |  | 37,280 | 3,722 | 9,166,018 | 1,371,938 | (61,478) |  |  |
Balance, end of period at Sep. 30, 2020 |  |  |  |  |  |  |  | 232,516 | 4,370
Balance, beginning of year at Jun. 30, 2020 |  | 37,280 | 3,722 | 9,118,332 | 1,505,694 | (67,355) |  |  |
Balance, beginning of year at Jun. 30, 2020 |  |  |  |  |  |  |  | 235,169 | 4,634
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 57 |  |  |  |  |
Exercise of share options |  |  |  | 104 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,197 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  |  | 1,984 |  |  |  |  |
Share options |  |  |  | 526 |  |  |  |  |
ESPP discount |  |  |  | 210 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 111 |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership |  |  |  | 41,072 |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,425 |  |  |  | (2,425) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 57 |  |  |  |  |
Exercise of share options |  |  |  | 104 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,197 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 91,286 |  |  |  | 91,286 |  |  |  |
Common Share distributions |  |  |  |  | (224,269) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (5,877) |  |  |  |  | 5,877 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 0.6025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  |  | 1,984 |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (57) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 2,499 |
Net income attributable to Noncontrolling Interests | 3,376 |  |  |  |  |  |  | 3,376 | 703
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,963) | (1,043)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership |  |  |  |  |  |  |  | 1,917 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,425 |  |  |  | (2,425) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 3,376 |  |  |  |  |  |  | 3,376 | 703
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 76
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,963) | (1,043)
Balance, end of period at Sep. 30, 2020 |  | 37,280 | 3,722 | 9,166,018 | 1,371,938 | (61,478) |  |  |
Balance, end of period at Sep. 30, 2020 |  |  |  |  |  |  |  | 232,516 | 4,370
Balance, beginning of year at Dec. 31, 2020 | 10,525,651 | 37,280 | 3,723 | 9,128,599 | 1,399,715 | (43,666) |  |  |
Balance, beginning of year at Dec. 31, 2020 | 237,835 |  |  |  |  |  |  | 233,162 | 4,673
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 11 | 68,246 |  |  |  |  |
Exercise of share options |  |  | 14 | 68,793 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,454 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 1 | 6,571 |  |  |  |  |
Share options |  |  |  | 2,541 |  |  |  |  |
ESPP discount |  |  |  | 798 |  |  |  |  |
Offering costs |  |  |  | (267) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (1,335) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership | 119,237 |  |  | (119,237) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (27,085) |  |  |  | 27,085 |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 11 | 68,246 |  |  |  |  |
Exercise of share options |  |  | 14 | 68,793 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,454 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 805,876 |  |  |  | 805,876 |  |  |  |
Common Share distributions |  |  |  |  | (676,158) |  |  |  |
Preferred Share distributions |  |  |  |  | (2,318) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (7,000) |  |  |  |  | 7,000 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 1.8075 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 1 | 6,571 |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (68,257) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 14,173 |
Net income attributable to Noncontrolling Interests | 27,903 |  |  |  |  |  |  | 27,903 | 1,957
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (23,366) | (4,492)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 1,745 |  |  |  |  |  |  | (1,745) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (27,085) |  |  |  | 27,085 |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 27,903 |  |  |  |  |  |  | 27,903 | 1,957
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (23,366) | (4,492)
Balance, end of period at Sep. 30, 2021 | 10,662,557 | 37,280 | 3,750 | 9,131,078 | 1,527,115 | (36,666) |  |  |
Balance, end of period at Sep. 30, 2021 | 211,093 |  |  |  |  |  |  | 208,955 | 2,138
Balance, beginning of year at Jun. 30, 2021 |  | 37,280 | 3,744 | 9,110,121 | 1,321,875 | (39,029) |  |  |
Balance, beginning of year at Jun. 30, 2021 |  |  |  |  |  |  |  | 205,691 | 2,365
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 1,597 |  |  |  |  |
Exercise of share options |  |  | 6 | 29,178 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 788 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  |  | 1,758 |  |  |  |  |
Share options |  |  |  | 565 |  |  |  |  |
ESPP discount |  |  |  | 165 |  |  |  |  |
Offering costs |  |  |  | (267) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 722 |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership |  |  |  | (17,271) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 3,722 |  |  |  | (3,722) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 1,597 |  |  |  |  |
Exercise of share options |  |  | 6 | 29,178 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 788 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 431,951 |  |  |  | 431,951 |  |  |  |
Common Share distributions |  |  |  |  | (225,938) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (2,363) |  |  |  |  | 2,363 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.6025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  |  | 1,758 |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (1,597) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 3,642 |
Net income attributable to Noncontrolling Interests | 14,847 |  |  |  |  |  |  | 14,847 | 534
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,367) | (761)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership |  |  |  |  |  |  |  | (2,539) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 3,722 |  |  |  | (3,722) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 14,847 |  |  |  |  |  |  | 14,847 | 534
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,367) | (761)
Balance, end of period at Sep. 30, 2021 | 10,662,557 | $ 37,280 | $ 3,750 | $ 9,131,078 | $ 1,527,115 | $ (36,666) |  |  |
Balance, end of period at Sep. 30, 2021 | $ 211,093 |  |  |  |  |  |  | $ 208,955 | $ 2,138

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