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Consolidated Statements of Partners' Equity - USD ($) $ in Thousands | Total | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | BRANDYWINE OPERATING PARTNERSHIP, L.P. | BRANDYWINE OPERATING PARTNERSHIP, L.P. Accumulated Other Comprehensive Income (Loss) | BRANDYWINE OPERATING PARTNERSHIP, L.P. Noncontrolling Interests | BRANDYWINE OPERATING PARTNERSHIP, L.P. General Partner Capital | BRANDYWINE OPERATING PARTNERSHIP, L.P. Cumulative effect of accounting change | BRANDYWINE OPERATING PARTNERSHIP, L.P. Cumulative effect of accounting change General Partner Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 176,873,324 |  |
Beginning Balance at Dec. 31, 2018 |  |  |  | $ 1,798,508 | $ 4,725 | $ 2,192 | $ 1,791,591 | $ (5,336) | $ (5,336)
Net income | $ 4,583 |  | $ 60 | 4,583 |  | 34 | $ 4,549 |  |
Other comprehensive income (loss) | (2,483) | $ (2,469) | (14) | (2,483) | (2,483) |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | (458) |  |
Deferred compensation obligation | 0 |  |  | 0 |  |  |  |  |
Repurchase and retirement of LP units (in shares) |  |  |  |  |  |  | (1,337,169) |  |
Repurchase and retirement of LP units |  |  |  | (17,281) |  |  | $ (17,281) |  |
Issuance of partnership interest in consolidated real estate ventures | 22 |  | 22 | 22 |  | 22 |  |  |
Share-based compensation activity (in shares) |  |  |  |  |  |  | 465,883 |  |
Share-based compensation activity | 3,677 |  |  | 3,677 |  |  | $ 3,677 |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | (3,088) |  |  | (3,088) |  |
Distributions declared to general partnership unitholders |  |  |  | (33,560) |  |  | $ (33,560) |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | 176,001,580 |  |
Ending Balance at Mar. 31, 2019 |  |  |  | 1,745,042 | 2,242 | 2,248 | $ 1,740,552 |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 176,873,324 |  |
Beginning Balance at Dec. 31, 2018 |  |  |  | 1,798,508 | 4,725 | 2,192 | $ 1,791,591 | $ (5,336) | $ (5,336)
Net income | 17,655 |  |  | 17,655 |  |  |  |  |
Other comprehensive income (loss) | (8,627) |  |  | (8,627) |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | 176,194,918 |  |
Ending Balance at Sep. 30, 2019 |  |  |  | 1,687,709 | (3,902) | 2,277 | $ 1,689,334 |  |
Beginning balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | 176,001,580 |  |
Beginning Balance at Mar. 31, 2019 |  |  |  | 1,745,042 | 2,242 | 2,248 | $ 1,740,552 |  |
Net income | 6,252 |  | 47 | 6,252 |  | 13 | $ 6,239 |  |
Other comprehensive income (loss) | (4,746) | (4,720) | (26) | (4,746) | (4,746) |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | 100,908 |  |
Deferred compensation obligation | 0 |  |  | 0 |  |  |  |  |
Repurchase and retirement of LP units (in shares) |  |  |  |  |  |  | 1,245 |  |
Repurchase and retirement of LP units |  |  |  | 0 |  |  |  |  |
Issuance of partnership interest in consolidated real estate ventures | 3 |  | 3 | 3 |  | 3 |  |  |
Share-based compensation activity (in shares) |  |  |  |  |  |  | 94,150 |  |
Share-based compensation activity | 1,451 |  |  | 1,451 |  |  | $ 1,451 |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | 1,014 |  |  | 1,014 |  |
Distributions declared to general partnership unitholders |  |  |  | (33,571) |  |  | $ (33,571) |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 176,197,883 |  |
Ending Balance at Jun. 30, 2019 |  |  |  | 1,715,445 | (2,504) | 2,264 | $ 1,715,685 |  |
Net income | 6,820 |  | 48 | 6,820 |  | 11 | $ 6,809 |  |
Other comprehensive income (loss) | (1,398) | (1,390) | (8) | (1,398) | (1,398) |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | (2,965) |  |
Deferred compensation obligation | 0 |  |  | 0 |  |  |  |  |
Issuance of partnership interest in consolidated real estate ventures | 2 |  | 2 | 2 |  | 2 |  |  |
Share-based compensation activity | 1,105 |  |  | 1,105 |  |  | $ 1,105 |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | (695) |  |  | (695) |  |
Distributions declared to general partnership unitholders |  |  |  | (33,570) |  |  | $ (33,570) |  |
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | 176,194,918 |  |
Ending Balance at Sep. 30, 2019 |  |  |  | 1,687,709 | (3,902) | 2,277 | $ 1,689,334 |  |
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 176,480,095 |  |
Beginning Balance at Dec. 31, 2019 |  |  |  | 1,672,915 | (2,715) | 1,091 | $ 1,674,539 |  |
Net income | 8,087 |  | 65 | 8,087 |  | 12 | $ 8,075 |  |
Other comprehensive income (loss) | (7,869) | (7,825) | (44) | (7,869) | (7,869) |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | (12,376) |  |
Deferred compensation obligation | (193) |  |  | (193) |  |  | $ (193) |  |
Repurchase and retirement of LP units (in shares) |  |  |  |  |  |  | (5,644,200) |  |
Repurchase and retirement of LP units |  |  |  | (53,858) |  |  | $ (53,858) |  |
Share-based compensation activity (in shares) |  |  |  |  |  |  | 142,468 |  |
Share-based compensation activity | 2,031 |  |  | 2,031 |  |  | $ 2,031 |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | 5,220 |  |  | 5,220 |  |
Distributions declared to general partnership unitholders |  |  |  | (32,500) |  |  | $ (32,500) |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 170,965,987 |  |
Ending Balance at Mar. 31, 2020 |  |  |  | 1,593,833 | (10,584) | 1,103 | $ 1,603,314 |  |
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 176,480,095 |  |
Beginning Balance at Dec. 31, 2019 |  |  |  | 1,672,915 | (2,715) | 1,091 | $ 1,674,539 |  |
Net income | 288,240 |  |  | 288,240 |  |  |  |  |
Other comprehensive income (loss) | (6,415) |  |  | (6,415) |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | 170,572,964 |  |
Ending Balance at Sep. 30, 2020 |  |  |  | 1,805,832 | (9,130) | 72 | $ 1,814,890 |  |
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 170,965,987 |  |
Beginning Balance at Mar. 31, 2020 |  |  |  | 1,593,833 | (10,584) | 1,103 | $ 1,603,314 |  |
Net income | 4,020 |  | 24 | 4,020 |  | 10 | $ 4,010 |  |
Other comprehensive income (loss) | 226 | 225 | 1 | 226 | 226 |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | 44,827 |  |
Deferred compensation obligation | (11) |  |  | (11) |  |  | $ (11) |  |
Repurchase and retirement of LP units (in shares) |  |  |  |  |  |  | (604,283) |  |
Repurchase and retirement of LP units |  |  |  | (6,141) |  |  | $ (6,141) |  |
Share-based compensation activity (in shares) |  |  |  |  |  |  | 166,628 |  |
Share-based compensation activity | 1,668 |  |  | 1,668 |  |  | $ 1,668 |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | (743) |  |  | (743) |  |
Distributions declared to general partnership unitholders |  |  |  | (32,540) |  |  | $ (32,540) |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | 170,573,159 |  |
Ending Balance at Jun. 30, 2020 |  |  |  | 1,560,312 | (10,358) | 1,113 | $ 1,569,557 |  |
Net income | 276,133 |  | 1,612 | 276,133 |  | (2) | $ 276,135 |  |
Other comprehensive income (loss) | 1,228 | $ 1,221 | 7 | 1,228 | 1,228 |  |  |  |
Deferred compensation obligation (in shares) |  |  |  |  |  |  | (195) |  |
Deferred compensation obligation | (2) |  |  | (2) |  |  | $ (2) |  |
Distributions from consolidated real estate ventures | (22) |  | (22) | (22) |  | (22) |  |  |
Share-based compensation activity | 1,263 |  |  | 1,263 |  |  | 1,263 |  |
Impact of deconsolidation of real estate venture | $ (1,017) |  | $ (1,017) | (1,017) |  | (1,017) |  |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | 400 |  |  | 400 |  |
Distributions declared to general partnership unitholders |  |  |  | (32,463) |  |  | $ (32,463) |  |
Ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | 170,572,964 |  |
Ending Balance at Sep. 30, 2020 |  |  |  | $ 1,805,832 | $ (9,130) | $ 72 | $ 1,814,890 |  |

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