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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, 2018 |  | $ 37,280 | $ 3,694 | $ 8,935,453 | $ 1,261,763 | $ (64,986) |  |  |
Balance, beginning of year at Dec. 31, 2018 |  |  |  |  |  |  |  | $ 228,738 | $ (2,293)
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,869 |  |  |  |  |
Exercise of share options |  |  | 10 | 48,477 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,652 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 2 | 7,980 |  |  |  |  |
Share options |  |  |  | 1,682 |  |  |  |  |
ESPP discount |  |  |  | 365 |  |  |  |  |
Offering costs |  |  |  | (155) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (1,539) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership | $ 56,974 |  |  | (56,974) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 7,771 |  |  |  | (7,771) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,869 |  |  |  |  |
Exercise of share options |  |  | 10 | 48,477 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,652 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 413,507 |  |  |  | 413,507 |  |  |  |
Common Share distributions |  |  |  |  | (420,916) |  |  |  |
Preferred Share distributions |  |  |  |  | (1,545) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (33,765) |  |  |  |  | (33,765) |  |  |
Losses reclassified into earnings from other comprehensive income | (8,902) |  |  |  |  | 8,902 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 1.135 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (4,871) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 10,829 |
Net income attributable to Noncontrolling Interests | 15,429 |  |  |  |  |  |  | 15,429 | 1,620
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (15,079) | (5,219)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | (45) |  |  |  |  |  |  | 45 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 7,771 |  |  |  | (7,771) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 15,429 |  |  |  |  |  |  | 15,429 | 1,620
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (15,079) | (5,219)
Balance, end of period at Jun. 30, 2019 |  | 37,280 | 3,708 | 8,949,581 | 1,252,809 | (89,849) |  |  |
Balance, end of period at Jun. 30, 2019 |  |  |  |  |  |  |  | 227,320 | (1,298)
Balance, beginning of year at Mar. 31, 2019 |  | 37,280 | 3,705 | 8,925,882 | 1,155,032 | (75,013) |  |  |
Balance, beginning of year at Mar. 31, 2019 |  |  |  |  |  |  |  | 225,081 | (5,462)
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 84 |  |  |  |  |
Exercise of share options |  |  | 3 | 18,624 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 526 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  |  | 3,404 |  |  |  |  |
Share options |  |  |  | 889 |  |  |  |  |
ESPP discount |  |  |  | 98 |  |  |  |  |
Offering costs |  |  |  | (155) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (937) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership |  |  |  | (1,953) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 3,119 |  |  |  | (3,119) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 84 |  |  |  |  |
Exercise of share options |  |  | 3 | 18,624 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 526 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 308,968 |  |  |  | 308,968 |  |  |  |
Common Share distributions |  |  |  |  | (210,419) |  |  |  |
Preferred Share distributions |  |  |  |  | (772) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (19,345) |  |  |  |  | (19,345) |  |  |
Losses reclassified into earnings from other comprehensive income | (4,509) |  |  |  |  | 4,509 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 0.5675 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (84) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 2,926 |
Net income attributable to Noncontrolling Interests | 11,510 |  |  |  |  |  |  | 11,510 | 821
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,474) | (1,251)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership |  |  |  |  |  |  |  | (1,520) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 3,119 |  |  |  | (3,119) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 11,510 |  |  |  |  |  |  | 11,510 | 821
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,474) | (1,251)
Balance, end of period at Jun. 30, 2019 |  | 37,280 | 3,708 | 8,949,581 | 1,252,809 | (89,849) |  |  |
Balance, end of period at Jun. 30, 2019 |  |  |  |  |  |  |  | 227,320 | (1,298)
Balance, beginning of year at Dec. 31, 2019 | 10,315,506 | 37,280 | 3,717 | 8,965,577 | 1,386,495 | (77,563) |  |  |
Balance, beginning of year at Dec. 31, 2019 | 229,020 |  |  |  |  |  |  | 227,837 | 1,183
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,855 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,320 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 2,359 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 2 | 7,252 |  |  |  |  |
Share options |  |  |  | 1,293 |  |  |  |  |
ESPP discount |  |  |  | 416 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (506) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership | (128,753) |  |  | 128,753 |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (1,987) |  |  |  | 1,987 |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,855 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,320 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 2,359 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 569,494 |  |  |  | 569,494 |  |  |  |
Common Share distributions |  |  |  |  | (448,750) |  |  |  |
Preferred Share distributions |  |  |  |  | (1,545) |  |  |  |
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 | (11,398) |  |  |  |  | 11,398 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 1.205 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  |  | 12 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (3,856) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 7,026 |
Net income attributable to Noncontrolling Interests | 21,248 |  |  |  |  |  |  | 21,248 | 13,410
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (17,037) | (10,300)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | 2,048 |  |  |  |  |  |  | (2,048) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (1,987) |  |  |  | 1,987 |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 21,248 |  |  |  |  |  |  | 21,248 | 13,410
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 341
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (17,037) | (10,300)
Balance, end of period at Jun. 30, 2020 | 10,597,673 | 37,280 | 3,722 | 9,118,332 | 1,505,694 | (67,355) |  |  |
Balance, end of period at Jun. 30, 2020 | 239,803 |  |  |  |  |  |  | 235,169 | 4,634
Balance, beginning of year at Mar. 31, 2020 |  | 37,280 | 3,721 | 9,092,441 | 1,469,821 | (72,896) |  |  |
Balance, beginning of year at Mar. 31, 2020 |  |  |  |  |  |  |  | 235,580 | 4,739
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 2,011 |  |  |  |  |
Exercise of share options |  |  |  | 171 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,490 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  |  | 3,231 |  |  |  |  |
Share options |  |  |  | 623 |  |  |  |  |
ESPP discount |  |  |  | 263 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (655) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership |  |  |  | 17,304 |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 1,453 |  |  |  | (1,453) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 2,011 |  |  |  |  |
Exercise of share options |  |  |  | 171 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,490 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 260,888 |  |  |  | 260,888 |  |  |  |
Common Share distributions |  |  |  |  | (224,243) |  |  |  |
Preferred Share distributions |  |  |  |  | (772) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (223) |  |  |  |  | (223) |  |  |
Losses reclassified into earnings from other comprehensive income | (5,764) |  |  |  |  | 5,764 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.6025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (2,012) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 1,959 |
Net income attributable to Noncontrolling Interests | 9,713 |  |  |  |  |  |  | 9,713 | 880
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,961) | (985)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership |  |  |  |  |  |  |  | (657) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 1,453 |  |  |  | (1,453) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 9,713 |  |  |  |  |  |  | 9,713 | 880
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,961) | (985)
Balance, end of period at Jun. 30, 2020 | 10,597,673 | $ 37,280 | $ 3,722 | $ 9,118,332 | $ 1,505,694 | $ (67,355) |  |  |
Balance, end of period at Jun. 30, 2020 | $ 239,803 |  |  |  |  |  |  | $ 235,169 | $ 4,634

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