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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 6 months ended Jun. 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 |  |  |  | 331 |  |  | (331) |
Exercise of share options |  |  | 1 | 2,616 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 2,180 |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Restricted shares |  |  | 1 | 5,162 |  |  |  |
Share options |  |  |  | 8,536 |  |  |  |
ESPP discount |  |  |  | 400 |  |  |  |
Offering costs |  |  |  | (27) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (538) |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | 172 |  |  | (172) |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 110 |  |  | (110) |
PAID IN CAPITAL |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 331 |  |  | (331) |
Exercise of share options |  |  | 1 | 2,616 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 2,180 |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 325,411 |  |  |  | 325,411 |  |  |
Common Share distributions |  |  |  |  | (397,796) |  |  |
Preferred Share distributions |  |  |  |  | (1,545) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 11,995 |  |  |  |  | 11,995 |  |
Losses reclassified into earnings from other comprehensive income | (9,307) |  |  |  |  | 9,307 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 1 |
Conversion of OP Units into Common Shares |  |  |  | 331 |  |  | (331) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 8,116 |
Net income | 338,958 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (14,374) | (7,668)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | (644) |  |  |  |  |  | 644 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 110 |  |  | (110) |
Net income attributable to Noncontrolling Interests | 12,358 |  |  |  |  |  | 12,358 | 1,189
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income | 338,958 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (14,374) | (7,668)
Net income attributable to Noncontrolling Interests | 12,358 |  |  |  |  |  | 12,358 | 1,189
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 125
Balance, end of period at Jun. 30, 2018 | 10,208,437 | $ 37,280 | $ 3,683 | $ 8,905,184 | $ 1,329,600 | $ (67,310) |  |
Balance, end of period at Jun. 30, 2018 | $ 231,349 |  |  |  |  |  | $ 232,995 | $ (1,646)

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