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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 | 4,785 |  |  |  |  |
Exercise of share options |  |  | 7 | 29,853 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,126 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 2 | 4,576 |  |  |  |  |
Share options |  |  |  | 793 |  |  |  |  |
ESPP discount |  |  |  | 267 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (602) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | $ 55,021 |  |  | (55,021) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 4,652 |  |  |  | (4,652) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,785 |  |  |  |  |
Exercise of share options |  |  | 7 | 29,853 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,126 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 104,539 |  |  |  | 104,539 |  |  |  |
Common Share distributions |  |  |  |  | (210,497) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (14,420) |  |  |  |  | (14,420) |  |  |
Losses reclassified into earnings from other comprehensive income | (4,393) |  |  |  |  | 4,393 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.5675 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,785 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 7,903 |
Net income | 109,257 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,605) | (3,968)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | (1,565) |  |  |  |  |  |  | 1,565 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 4,652 |  |  |  | (4,652) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (4,787) |
Net income attributable to Noncontrolling Interests | 3,919 |  |  |  |  |  |  | 3,919 | 799
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 3,919 |  |  |  |  |  |  | 3,919 | 799
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,605) | (3,968)
Balance, end of period at Mar. 31, 2019 |  | 37,280 | 3,705 | 8,925,882 | 1,155,032 | (75,013) |  |  |
Balance, end of period at Mar. 31, 2019 |  |  |  |  |  |  |  | 225,081 | (5,462)
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 |  |  |  | 1,844 |  |  |  |  |
Exercise of share options |  |  | 2 | 11,149 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 869 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 2 | 4,021 |  |  |  |  |
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 to Noncontrolling Interests |  |  |  |  |  |  |  | 12 |
Conversion of OP Units into Common Shares |  |  |  | 1,844 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 5,067 |
Net income | 332,671 |  |  |  |  |  |  |  |
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 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (1,844) |
Net income attributable to Noncontrolling Interests | 11,535 |  |  |  |  |  |  | 11,535 | 12,530
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 | 10,530,367 | $ 37,280 | $ 3,721 | $ 9,092,441 | $ 1,469,821 | $ (72,896) |  |  |
Balance, end of period at Mar. 31, 2020 | $ 240,319 |  |  |  |  |  |  | $ 235,580 | $ 4,739

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