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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 |  |  |  | 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 |  |  |  |  |
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 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | $ 1.08 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  |  | 1 |
Conversion of OP Units into Common Shares |  |  |  | 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) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (331) |
Net income attributable to Noncontrolling Interests | 12,358 |  |  |  |  |  |  | 12,358 | 1,189
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 12,358 |  |  |  |  |  |  | 12,358 | 1,189
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (14,374) | (7,668)
Balance, end of period at Jun. 30, 2018 |  | 37,280 | 3,683 | 8,905,184 | 1,329,600 | (67,310) |  |  |
Balance, end of period at Jun. 30, 2018 |  |  |  |  |  |  |  | 232,995 | (1,646)
Balance, beginning of year at Mar. 31, 2018 |  | 37,280 | 3,682 | 8,910,306 | 1,415,638 | (77,734) |  |  |
Balance, beginning of year at Mar. 31, 2018 |  |  |  |  |  |  |  | 234,628 | 1,293
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 197 |  |  |  |  |
Exercise of share options |  |  |  | 1,017 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 499 |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Restricted shares |  |  |  | 2,540 |  |  |  |  |
Share options |  |  |  | 1,198 |  |  |  |  |
ESPP discount |  |  |  | 103 |  |  |  |  |
Offering costs |  |  |  | (1) |  |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (621) |  |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership |  |  |  | (13,003) |  |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,949 |  |  |  | (2,949) |
PAID IN CAPITAL |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 197 |  |  |  |  |
Exercise of share options |  |  |  | 1,017 |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 499 |  |  |  |  |
RETAINED EARNINGS |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 113,602 |  |  |  | 113,602 |  |  |  |
Common Share distributions |  |  |  |  | (198,868) |  |  |  |
Preferred Share distributions |  |  |  |  | (772) |  |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | 5,908 |  |  |  |  | 5,908 |  |  |
Losses reclassified into earnings from other comprehensive income | (4,516) |  |  |  |  | 4,516 |  |  |
DISTRIBUTIONS |  |  |  |  |  |  |  |  |
Distributions declared per Common Share outstanding |  |  |  |  |  |  | 0.54 |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  |  | 197 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 3,313 |
Net income | 118,410 |  |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,186) | (3,448)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership |  |  |  |  |  |  |  | 1,087 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 2,949 |  |  |  | (2,949) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (197) |
Net income attributable to Noncontrolling Interests | 4,299 |  |  |  |  |  |  | 4,299 | 509
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 4,299 |  |  |  |  |  |  | 4,299 | 509
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (7,186) | (3,448)
Balance, end of period at Jun. 30, 2018 |  | 37,280 | 3,683 | 8,905,184 | 1,329,600 | (67,310) |  |  |
Balance, end of period at Jun. 30, 2018 |  |  |  |  |  |  |  | 232,995 | (1,646)
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 |  |  | 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 into Common Shares |  |  | 2 | 4,869 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 10,829 |
Net income | 430,556 |  |  |  |  |  |  |  |
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) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (4,871) |
Net income attributable to Noncontrolling Interests | 15,429 |  |  |  |  |  |  | 15,429 | 1,620
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 | 10,153,529 | 37,280 | 3,708 | 8,949,581 | 1,252,809 | (89,849) |  |  |
Balance, end of period at Jun. 30, 2019 | 226,022 |  |  |  |  |  |  | 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 into Common Shares |  |  |  | 84 |  |  |  |  |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  |  | 2,926 |
Net income | 321,299 |  |  |  |  |  |  |  |
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) |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  |  | (84) |
Net income attributable to Noncontrolling Interests | 11,510 |  |  |  |  |  |  | 11,510 | 821
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 | 10,153,529 | $ 37,280 | $ 3,708 | $ 8,949,581 | $ 1,252,809 | $ (89,849) |  |  |
Balance, end of period at Jun. 30, 2019 | $ 226,022 |  |  |  |  |  |  | $ 227,320 | $ (1,298)

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