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Consolidated Statements of Partners' Equity - USD ($) $ in Thousands | Total | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. | BRANDYWINE OPERATING PARTNERSHIP, L.P. General Partner Capital [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. Accumulated Other Comprehensive Income (Loss) [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. Noncontrolling Interest [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. Series E-linked Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 |  |  |  | $ 1,859,642 | $ 1,762,764 | $ (2,122) | $ 2,150 | $ 96,850
Beginning Balance, Shares at Dec. 31, 2016 |  |  |  |  | 175,140,760 |  |  | 4,000,000
Net income | $ 48,015 |  | $ 384 | 48,015 | $ 47,990 |  | 25 |
Other comprehensive income | 846 | $ 839 | 7 | 846 |  | 846 |  |
Redemption of Preferred Mirror Units |  |  |  | (96,850) |  |  |  | $ (96,850)
Redemption of Preferred Mirror Units, Shares |  |  |  |  |  |  |  | (4,000,000)
Share Issuance from/(to) Deferred Compensation Plan | (48) |  |  | (48) | $ (48) |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  |  |  | 1,718 |  |  |
Issuance of LP Units |  |  |  | (499) | $ (499) |  |  |
Issuance of partnership interest in consolidated real estate ventures | 85 |  | 85 | 86 |  |  | 86 |
Distributions from consolidated real estate ventures | (46) |  | (46) | (46) |  |  | (46) |
Share Choice Plan Issuance, Shares |  |  |  |  | (1,423) |  |  |
Bonus share issuance | 110 |  |  | 110 | $ 110 |  |  |
Bonus share issuance, Shares |  |  |  |  | 6,752 |  |  |
Share-based compensation activity | 5,907 |  |  | 5,907 | $ 5,907 |  |  |
Share-based compensation activity, Shares |  |  |  |  | 333,127 |  |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | (2,781) | $ (2,781) |  |  |
Preferred Share distributions | (2,032) |  |  | (2,032) | (2,032) |  |  |
Preferred share redemption charge | (3,181) |  |  | (3,181) | (3,181) |  |  |
Distributions declared to general partnership unitholders |  |  |  | (84,463) | (84,463) |  |  |
Ending Balance at Sep. 30, 2017 |  |  |  | 1,724,706 | $ 1,723,767 | (1,276) | 2,215 |
Ending Balance, Shares at Sep. 30, 2017 |  |  |  |  | 175,477,498 |  |  |
Beginning Balance at Dec. 31, 2017 |  |  |  | 1,819,682 | $ 1,815,411 | 2,056 | 2,215 |
Beginning Balance, Shares at Dec. 31, 2017 |  |  |  |  | 178,285,236 |  |  |
Net income | 14,579 |  | 167 | 14,579 | $ 14,533 |  | 46 |
Other comprehensive income | 7,906 | $ 7,840 | 66 | 7,906 |  | 7,906 |  |
Share Issuance from/(to) Deferred Compensation Plan | (111) |  |  | (111) | $ (111) |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  |  |  | (99,189) |  |  |
Issuance of LP Units |  |  |  | 416 | $ 416 |  |  |
Issuance of LP Units, Shares |  |  |  |  | 23,311 |  |  |
Issuance of partnership interest in consolidated real estate ventures | 16 |  | 16 | 16 |  |  | 16 |
Distributions from consolidated real estate ventures | (54) |  | $ (54) | (54) |  |  | (54) |
Share Choice Plan Issuance, Shares |  |  |  |  | (1,285) |  |  |
Share-based compensation activity | 4,972 |  |  | 4,972 | $ 4,972 |  |  |
Share-based compensation activity, Shares |  |  |  |  | 196,151 |  |  |
Adjustment of redeemable partnership units to liquidation value at period end |  |  |  | 2,880 | $ 2,880 |  |  |
Preferred Share distributions | 0 |  |  | 0 |  |  |  |
Preferred share redemption charge | $ 0 |  |  | 0 |  |  |  |
Distributions declared to general partnership unitholders |  |  |  | (96,722) | (96,722) |  |  |
Ending Balance at Sep. 30, 2018 |  |  |  | $ 1,753,564 | $ 1,741,379 | $ 9,962 | $ 2,223 |
Ending Balance, Shares at Sep. 30, 2018 |  |  |  |  | 178,602,602 |  |  |

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