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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, 2017 |  | $ 37,280 | $ 3,680 | $ 8,886,586 | $ 1,403,530 | $ (88,612) |  |  |
Balance, beginning of year at Dec. 31, 2017 |  |  |  |  |  |  |  | $ 226,691 | $ 4,708
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 356 |  |  |  |  |
Exercise of share options |  |  | 2 | 5,998 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,073 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 1 | 6,803 |  |  |  |  |
Share options |  |  |  | 9,206 |  |  |  |  |
ESPP discount |  |  |  | 604 |  |  |  |  |
Offering costs |  |  |  | (27) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (533) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | $ 14,361 |  |  | (14,361) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,619 |  |  |  | (2,619) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 356 |  |  |  |  |
Exercise of share options |  |  | 2 | 5,998 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,073 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 540,348 |  |  |  | 540,348 |  |  |  |
Common Share distributions |  |  |  |  | (596,735) |  |  |  |
Preferred Share distributions |  |  |  |  | (2,318) |  |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 24,021 |  |  |  |  | 24,021 |  |  |
Losses reclassified into earnings from other comprehensive income | (13,902) |  |  |  |  | 13,902 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 1.62 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  |  | 1 |
Conversion of OP Units into Common Shares |  |  |  | 356 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 11,074 |
Net income | 562,804 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (21,560) | (8,930)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | (77) |  |  |  |  |  |  | 77 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,619 |  |  |  | (2,619) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (356) |
Net income attributable to Noncontrolling Interests | 20,517 |  |  |  |  |  |  | 20,517 | 1,939
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 20,517 |  |  |  |  |  |  | 20,517 | 1,939
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (21,560) | (8,930)
Balance, end of period at Sep. 30, 2018 |  | 37,280 | 3,684 | 8,900,324 | 1,344,825 | (50,689) |  |  |
Balance, end of period at Sep. 30, 2018 |  |  |  |  |  |  |  | 233,825 | (2,158)
Balance, beginning of year at Jun. 30, 2018 |  | 37,280 | 3,683 | 8,905,184 | 1,329,600 | (67,310) |  |  |
Balance, beginning of year at Jun. 30, 2018 |  |  |  |  |  |  |  | 232,995 | (1,646)
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 25 |  |  |  |  |
Exercise of share options |  |  | 1 | 3,382 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 893 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  |  | 1,641 |  |  |  |  |
Share options |  |  |  | 670 |  |  |  |  |
ESPP discount |  |  |  | 204 |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 5 |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership |  |  |  | (14,189) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,509 |  |  |  | (2,509) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 25 |  |  |  |  |
Exercise of share options |  |  | 1 | 3,382 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 893 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 214,937 |  |  |  | 214,937 |  |  |  |
Common Share distributions |  |  |  |  | (198,939) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 12,026 |  |  |  |  | 12,026 |  |  |
Losses reclassified into earnings from other comprehensive income | (4,595) |  |  |  |  | 4,595 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 0.54 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 25 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 2,958 |
Net income | 223,846 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,186) | (1,262)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership |  |  |  |  |  |  |  | (567) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,509 |  |  |  | (2,509) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (25) |
Net income attributable to Noncontrolling Interests | 8,159 |  |  |  |  |  |  | 8,159 | 750
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 8,159 |  |  |  |  |  |  | 8,159 | 750
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,186) | (1,262)
Balance, end of period at Sep. 30, 2018 |  | 37,280 | 3,684 | 8,900,324 | 1,344,825 | (50,689) |  |  |
Balance, end of period at Sep. 30, 2018 |  |  |  |  |  |  |  | 233,825 | (2,158)
Balance, beginning of year at Dec. 31, 2018 | 10,173,204 | 37,280 | 3,694 | 8,935,453 | 1,261,763 | (64,986) |  |  |
Balance, beginning of year at Dec. 31, 2018 | 226,445 |  |  |  |  |  |  | 228,738 | (2,293)
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 3 | 9,840 |  |  |  |  |
Exercise of share options |  |  | 14 | 67,052 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 2,323 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  | 2 | 10,302 |  |  |  |  |
Share options |  |  |  | 2,185 |  |  |  |  |
ESPP discount |  |  |  | 502 |  |  |  |  |
Offering costs |  |  |  | (789) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (1,539) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | 114,936 |  |  | (114,936) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 6,919 |  |  |  | (6,919) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 3 | 9,840 |  |  |  |  |
Exercise of share options |  |  | 14 | 67,052 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 2,323 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 680,613 |  |  |  | 680,613 |  |  |  |
Common Share distributions |  |  |  |  | (631,635) |  |  |  |
Preferred Share distributions |  |  |  |  | (2,318) |  |  |  |
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 | (14,659) |  |  |  |  | 14,659 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 1.7025 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 3 | 9,840 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 12,200 |
Net income | 708,402 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (22,493) | (6,453)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 957 |  |  |  |  |  |  | (957) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 6,919 |  |  |  | (6,919) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (9,843) |
Net income attributable to Noncontrolling Interests | 25,339 |  |  |  |  |  |  | 25,339 | 2,450
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 25,339 |  |  |  |  |  |  | 25,339 | 2,450
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 4,594
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (22,493) | (6,453)
Balance, end of period at Sep. 30, 2019 | 10,182,636 | 37,280 | 3,713 | 8,917,312 | 1,308,423 | (84,092) |  |  |
Balance, end of period at Sep. 30, 2019 | 224,363 |  |  |  |  |  |  | 226,065 | (1,702)
Balance, beginning of year at Jun. 30, 2019 |  | 37,280 | 3,708 | 8,949,581 | 1,252,809 | (89,849) |  |  |
Balance, beginning of year at Jun. 30, 2019 |  |  |  |  |  |  |  | 227,320 | (1,298)
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 4,971 |  |  |  |  |
Exercise of share options |  |  | 4 | 18,575 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 671 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  |  | 2,322 |  |  |  |  |
Share options |  |  |  | 503 |  |  |  |  |
ESPP discount |  |  |  | 137 |  |  |  |  |
Offering costs |  |  |  | (634) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership |  |  |  | (57,962) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (852) |  |  |  | 852 |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 4,971 |  |  |  |  |
Exercise of share options |  |  | 4 | 18,575 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 671 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 267,106 |  |  |  | 267,106 |  |  |  |
Common Share distributions |  |  |  |  | (210,719) |  |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (5,757) |  |  |  |  | 5,757 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 0.5675 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 4,971 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 1,371 |
Net income | 277,846 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,414) | (1,234)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership |  |  |  |  |  |  |  | (1,002) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (852) |  |  |  | 852 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (4,972) |
Net income attributable to Noncontrolling Interests | 9,910 |  |  |  |  |  |  | 9,910 | 830
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 9,910 |  |  |  |  |  |  | 9,910 | 830
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,414) | (1,234)
Balance, end of period at Sep. 30, 2019 | 10,182,636 | $ 37,280 | $ 3,713 | $ 8,917,312 | $ 1,308,423 | $ (84,092) |  |  |
Balance, end of period at Sep. 30, 2019 | $ 224,363 |  |  |  |  |  |  | $ 226,065 | $ (1,702)

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