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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 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, 2014 |  | $ 50,000 | $ 3,629 | $ 8,536,340 | $ 1,950,639 | $ (172,152) |  |
Balance, beginning of year at Dec. 31, 2014 |  |  |  |  |  |  | $ 214,411 | $ 124,909
PREFERRED SHARES |  |  |  |  |  |  |  |
Partial redemption of 8.29% Series K Cumulative Redeemable |  | (12,720) |  |  |  |  |  |
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,964 |  |  |  |
Exercise of share options |  |  | 14 | 59,494 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 4,403 |  |  |  |
Restricted shares |  |  | 2 | 15,064 |  |  |  |
Share options |  |  |  | 3,756 |  |  |  |
ESPP discount |  |  |  | 884 |  |  |  |
PAID IN CAPITAL |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 2 | 4,964 |  |  |  |
Exercise of share options |  |  | 14 | 59,494 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 4,403 |  |  |  |
Conversion of restricted shares to restricted units |  |  |  | 70 |  |  | 70 |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Offering costs |  |  |  | (79) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 1,380 |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | $ 64,378 |  |  | (64,378) |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 10,607 |  |  | (10,607) |
Conversion of restricted shares to restricted units |  |  |  | (70) |  |  | (70) |
RETAINED EARNINGS |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 870,120 |  |  |  | 870,120 |  |  |
Common Share distributions |  |  |  |  | (804,825) |  |  |
Preferred Share distributions |  |  |  |  | (3,357) |  |  |
Premium on redemption of Preferred Shares - cash charge |  |  |  |  | (3,486) |  |  |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the year | 2,219 |  |  |  |  | 2,219 |  |
Losses reclassified into earnings from other comprehensive income | (18,244) |  |  |  |  | 18,244 |  |
Currency translation adjustments arising during the year | (327) |  |  |  |  | (327) |  |
Balance, beginning of year at Dec. 31, 2014 |  |  |  |  |  |  | 214,411 | 124,909
OPERATING PARTNERSHIP |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 3 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  | (4,966) |
Conversion of restricted shares to restricted units |  |  |  | 70 |  |  | 70 |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 21,503 |
Net income attributable to Noncontrolling Interests | 34,241 |  |  |  |  |  | 34,241 | 3,657
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (31,604) | (6,608)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | 1,672 |  |  |  |  |  | (1,672) |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 10,607 |  |  | (10,607) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 34,241 |  |  |  |  |  | 34,241 | 3,657
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (31,604) | (6,608)
Deconsolidation of previously consolidated Noncontrolling Interests |  |  |  |  |  |  |  | (117,350)
Balance, end of period at Dec. 31, 2015 |  | 37,280 | 3,648 | 8,572,365 | 2,009,091 | (152,016) |  |
Balance, end of period at Dec. 31, 2015 |  |  |  |  |  |  | 221,379 | 4,608
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,725 |  |  |  |
Exercise of share options |  |  | 8 | 35,825 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,685 |  |  |  |
Restricted shares |  |  | 1 | 15,015 |  |  |  |
Share options |  |  |  | 3,432 |  |  |  |
ESPP discount |  |  |  | 650 |  |  |  |
PAID IN CAPITAL |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 | 3,725 |  |  |  |
Exercise of share options |  |  | 8 | 35,825 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,685 |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Offering costs |  |  |  | (314) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 748 |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | (115,093) |  |  | 115,093 |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 8,198 |  |  | (8,198) |
RETAINED EARNINGS |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 4,292,163 |  |  |  | 4,292,163 |  |  |
Common Share distributions |  |  |  |  | (4,754,537) |  |  |
Preferred Share distributions |  |  |  |  | (3,091) |  |  |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the year | (3,915) |  |  |  |  | (3,915) |  |
Losses reclassified into earnings from other comprehensive income | (41,758) |  |  |  |  | 41,758 |  |
Currency translation adjustments arising during the year | 264 |  |  |  |  | 264 |  |
Balance, beginning of year at Dec. 31, 2015 |  |  |  |  |  |  | 221,379 | 4,608
OPERATING PARTNERSHIP |  |  |  |  |  |  |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  |  |  |  | 1 |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  | (3,726) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 18,180 |
Net income attributable to Noncontrolling Interests | 171,511 |  |  |  |  |  | 171,511 | 16,430
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (187,448) | (36,268)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | (9,598) |  |  |  |  |  | 9,598 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 8,198 |  |  | (8,198) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 171,511 |  |  |  |  |  | 171,511 | 16,430
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (187,448) | (36,268)
Other |  |  |  |  |  |  |  | 25,839
Balance, end of period at Dec. 31, 2016 | 10,229,078 | 37,280 | 3,659 | 8,758,422 | 1,543,626 | (113,909) |  |
Balance, end of period at Dec. 31, 2016 | 231,906 |  |  |  |  |  | 221,297 | 10,609
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 11 | 15,889 |  |  |  |
Exercise of share options |  |  | 8 | 31,588 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,743 |  |  |  |
Restricted shares |  |  | 1 | 9,776 |  |  |  |
Share options |  |  |  | 6,835 |  |  |  |
ESPP discount |  |  |  | 747 |  |  |  |
PAID IN CAPITAL |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 11 | 15,889 |  |  |  |
Exercise of share options |  |  | 8 | 31,588 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 | 3,743 |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |
Offering costs |  |  |  | (51) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (594) |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | (41,916) |  |  | 41,916 |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 18,315 |  |  | (18,315) |
RETAINED EARNINGS |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 603,454 |  |  |  | 603,454 |  |  |
Common Share distributions |  |  |  |  | (740,459) |  |  |
Preferred Share distributions |  |  |  |  | (3,091) |  |  |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the year | 6,439 |  |  |  |  | 6,439 |  |
Losses reclassified into earnings from other comprehensive income | (18,858) |  |  |  |  | 18,858 |  |
Currency translation adjustments arising during the year | 0 |  |  |  |  |  |  |
Balance, beginning of year at Dec. 31, 2016 | 231,906 |  |  |  |  |  | 221,297 | 10,609
OPERATING PARTNERSHIP |  |  |  |  |  |  |  |
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner |  |  |  |  |  |  | (15,900) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 10,523 |
Net income attributable to Noncontrolling Interests | 22,604 |  |  |  |  |  | 22,604 | 2,323
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (26,739) | (8,349)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | (33,221) |  |  |  |  |  | 33,221 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 18,315 |  |  | (18,315) |
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income attributable to Noncontrolling Interests | 22,604 |  |  |  |  |  | 22,604 | 2,323
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 125
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (26,739) | (8,349)
Balance, end of period at Dec. 31, 2017 | 10,242,464 | $ 37,280 | $ 3,680 | $ 8,886,586 | $ 1,403,530 | $ (88,612) |  |
Balance, end of period at Dec. 31, 2017 | $ 231,399 |  |  |  |  |  | $ 226,691 | $ 4,708

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