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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Total | PREFERRED SHARES | COMMON SHARES, $0.01 PAR VALUE | PAID IN CAPITAL | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | OPERATING PARTNERSHIP | PARTIALLY OWNED PROPERTIES
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2017 | $ 10,242,464 | $ 37,280 | $ 3,680 | $ 8,886,586 | $ 1,403,530 | $ (88,612) |  |
Balance, beginning of year at Dec. 31, 2017 | 231,399 |  |  |  |  |  | $ 226,691 | $ 4,708
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 356 |  |  | (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 |  |  | (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 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 1 |
Conversion of OP Units into Common Shares |  |  |  | 356 |  |  | (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) |
Net income attributable to Noncontrolling Interests | 20,517 |  |  |  |  |  | 20,517 | 1,939
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income | 562,804 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (21,560) | (8,930)
Net income attributable to Noncontrolling Interests | 20,517 |  |  |  |  |  | 20,517 | 1,939
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 125
Balance, end of period at Sep. 30, 2018 | 10,235,424 | $ 37,280 | $ 3,684 | $ 8,900,324 | $ 1,344,825 | $ (50,689) |  |
Balance, end of period at Sep. 30, 2018 | $ 231,667 |  |  |  |  |  | $ 233,825 | $ (2,158)

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