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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 06, 2018 | Apr. 11, 2017 | Jan. 10, 2017 | Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 03, 2019
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Dividends, Common Stock | $ 33,600,000 |  |  |  |  |  |  |  |
Dividends payable, date to be paid | Jan. 22, 2019 |  |  |  |  |  |  |  |
Dividends payable, date of record | Jan. 08, 2019 |  |  |  |  |  |  |  |
Preferred share redemption charge |  |  |  |  |  | $ 0 | $ 3,181,000 | $ 0 |
Repurchased and Retired, Shares |  |  |  |  |  | 1,729,278 | 0 | 0 |
Share Price |  |  |  |  |  | $ 12.64 |  |  |
Repurchased and Retired, Value |  |  |  |  |  | $ 21,858,000 |  |  |
Common Stock, Par or Stated Value Per Share (USD per share) | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Common Stock, Shares Authorized | 400,000,000 |  |  |  |  | 400,000,000 | 400,000,000 |  |
Upfront costs |  |  |  |  |  |  | $ 499,000 |  |
Common shares issued under offering program |  |  |  |  |  |  |  | 0 |
Cash proceeds, net of issuance costs |  |  |  |  |  | $ 416,000 | $ 51,225,000 | $ 0 |
Offering Program [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 16,000,000 |  |  |  |  |
Upfront costs |  |  |  | $ 200,000 |  |  |  |  |
Common shares issued under offering program |  |  |  |  |  | 23,311 | 2,858,991 | 0 |
Weighted average price per share | $ 18.04 |  |  |  |  | $ 18.04 | $ 18.19 |  |
Cash proceeds, net of issuance costs |  |  |  |  |  | $ 400,000 | $ 51,200,000 |  |
Common shares remain available for issuance | 13,117,698 |  |  |  |  | 13,117,698 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Authorized Amount |  |  |  |  |  |  |  |  | $ 150,000,000.0
Repurchased and Retired, Shares |  |  |  |  | 1,337,169 |  |  |  |
Share Price |  |  |  |  | $ 12.92 |  |  |  |
Repurchased and Retired, Value |  |  |  |  | $ 17,300,000 |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Authorized Amount |  |  |  |  |  |  |  |  | $ 150,000,000
Dividend Declared [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.19 |  |  |  |  | $ 0.19 |  |  |
Class A Units [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price | $ 12.87 |  |  |  |  | $ 12.87 | $ 18.19 | $ 16.51 |
Limited Partners' Capital Account, Units Outstanding | 982,871 |  |  |  |  | 982,871 | 1,479,799 | 1,479,799 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Preferred units outstanding | 0 |  |  |  |  | 0 | 0 |  |
Dividends, Common Stock |  | $ 33,600,000 |  |  |  |  |  |  |
Dividends payable, date to be paid |  | Jan. 22, 2019 |  |  |  |  |  |  |
Dividends payable, date of record |  | Jan. 08, 2019 |  |  |  |  |  |  |
Preferred share redemption charge |  |  |  |  |  | $ 0 | $ 3,181,000 | $ 0 |
Repurchase program, number of mirror unit of operating partnership retired for each common share repurchased |  |  |  |  |  | 1 |  |  |
Cash proceeds, net of issuance costs |  |  |  |  |  | $ 416,000 | $ 51,225,000 | $ 0 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend Declared [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  | $ 0.19 |  |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Redemption outstanding shares |  |  | 4,000,000 |  |  |  |  |  |
Redemption price per share |  |  | $ 25.51 |  |  |  |  |  |
Accrued dividends paid in cash |  |  | $ 2,000,000.0 |  |  |  |  |  |
Preferred share redemption charge |  |  | $ 3,200,000 |  |  |  |  |  |

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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