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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 |  |  |  | 1,844 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,149 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 869 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 2 | 4,021 |  |  |  | 12 |
Share options |  |  |  | 670 |  |  |  |  |
ESPP discount |  |  |  | 153 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 149 |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests ?Operating Partnership | $ (111,449) |  |  | 111,449 |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (3,440) |  |  |  | 3,440 |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 1,844 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,149 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 869 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 308,606 |  |  |  | 308,606 |  |  |  |
Common Share distributions |  |  |  |  | (224,507) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (967) |  |  |  |  | (967) |  |  |
Losses reclassified into earnings from other comprehensive income | (5,634) |  |  |  |  | 5,634 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.6025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 2 | 4,021 |  |  |  | 12 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (1,844) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 5,067 |
Net income attributable to Noncontrolling Interests | 11,535 |  |  |  |  |  |  | 11,535 | 12,530
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (9,076) | (9,315)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 1,391 |  |  |  |  |  |  | (1,391) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (3,440) |  |  |  | 3,440 |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 11,535 |  |  |  |  |  |  | 11,535 | 12,530
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 341
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (9,076) | (9,315)
Balance, end of period at Mar. 31, 2020 |  | 37,280 | 3,721 | 9,092,441 | 1,469,821 | (72,896) |  |  |
Balance, end of period at Mar. 31, 2020 |  |  |  |  |  |  |  | 235,580 | 4,739
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 |  |  |  |  |  |  |  |  |
Exercise of share options |  |  | 5 | 22,877 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,731 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 1 | 2,273 |  |  |  |  |
Share options |  |  |  | 988 |  |  |  |  |
ESPP discount |  |  |  | 444 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (1,229) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests ?Operating Partnership | 72,956 |  |  | (72,956) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 619 |  |  |  | (619) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Exercise of share options |  |  | 5 | 22,877 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,731 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 57,539 |  |  |  | 57,539 |  |  |  |
Common Share distributions |  |  |  |  | (224,673) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (2,303) |  |  |  |  | 2,303 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.6025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units/shares |  |  | 1 | 2,273 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 6,488 |
Net income attributable to Noncontrolling Interests | 2,143 |  |  |  |  |  |  | 2,143 | 682
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (8,589) | (2,883)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | (2,384) |  |  |  |  |  |  | 2,384 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 619 |  |  |  | (619) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 2,143 |  |  |  |  |  |  | 2,143 | 682
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (8,589) | (2,883)
Balance, end of period at Mar. 31, 2021 | 10,314,800 | $ 37,280 | $ 3,729 | $ 9,083,346 | $ 1,231,808 | $ (41,363) |  |  |
Balance, end of period at Mar. 31, 2021 | $ 237,441 |  |  |  |  |  |  | $ 234,969 | $ 2,472

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