CONSOLIDATED STATEMENTS OF CASH FLOWS - BRANDYWINE OPERATING PARTNERSHIP L.P. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 53,992	$ 12,366	$ 307,326
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	177,984	178,105	188,283
Amortization of deferred financing costs	3,091	2,836	2,904
Amortization of debt discount/(premium), net	(5,254)	(1,951)	(568)
Amortization of stock compensation costs	8,939	7,130	6,627
Straight-line rent income	(13,631)	(13,485)	(14,743)
Amortization of acquired above (below) market leases, net	(2,581)	(5,377)	(4,867)
Straight-line ground rent expense	814	918	1,455
Provision for doubtful accounts	0	0	1,049
Net gain on real estate venture transactions	(26,718)	(2,973)	(75)
Total gain on sale of real estate	(25,684)	(3,045)	(289,662)
Loss on early extinguishment of debt	435	0	0
Provision for impairment	4,663	0	0
Loss from unconsolidated real estate ventures, including income distributions	23,522	26,697	18,584
Income tax provision (benefit)	55	47	(224)
Changes in assets and liabilities:
Accounts receivable	1,328	2,506	(2,031)
Other assets	(1,120)	(19,325)	(5,034)
Accounts payable and accrued expenses	5,405	2,974	14,374
Deferred income, gains and rent	1,567	2,986	(12,149)
Other liabilities	2,500	465	14,557
Net cash provided by operating activities	209,307	190,874	225,806
Cash flows from investing activities:
Acquisition of properties	(3,446)	0	(41,950)
Proceeds from the sale of properties	64,210	10,303	278,114
Proceeds from insurance	0	1,250	0
Proceeds from note receivable	44,300	50,000	0
Issuance of note receivable	0	0	(50,000)
Capital expenditures for tenant improvements	(86,774)	(56,830)	(73,166)
Capital expenditures for redevelopments	(87,223)	(48,022)	(21,664)
Capital expenditures for developments	(89,017)	(30,269)	(65,420)
Advances for the purchase of tenant assets, net of repayments	(447)	270	1,488
Investment in unconsolidated real estate ventures	(47,428)	(31,643)	(719)
Deposits for real estate	(4,900)	(2,550)	0
Capital distributions from unconsolidated real estate ventures	46,898	27,028	9,001
Leasing costs paid	(26,762)	(19,852)	(17,394)
Net cash provided by (used in) investing activities	(190,589)	(100,315)	18,290
Cash flows from financing activities:
Repayments of mortgage notes payable	0	0	(94,993)
Proceeds from credit facility borrowings	478,000	154,000	318,000
Repayments of credit facility borrowings	(412,500)	(131,000)	(318,000)
Proceeds from unsecured notes	350,000	0	0
Repayments of unsecured notes	(296,134)	0	0
Debt financing costs paid	(9,875)	0	0
Exercise of stock options, net	0	(63)	47
Shares used for employee taxes upon vesting of share awards	(2,941)	(1,762)	(1,346)
Partner contributions to consolidated real estate venture	0	2,765	0
Repurchase and retirement of common shares	0	0	(60,000)
Redemption of limited partnership units	(4,006)	(2,334)	0
Distributions paid to preferred and common partnership units	(130,724)	(130,255)	(131,150)
Net cash used in financing activities	(28,631)	(109,336)	(288,189)
Decrease in cash and cash equivalents and restricted cash	(9,913)	(18,777)	(44,093)
Cash and cash equivalents and restricted cash at beginning of year	28,300	47,077	91,170
Cash and cash equivalents and restricted cash at end of period	18,387	28,300	47,077
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	27,463	46,344	90,499
Restricted cash, beginning of period	837	733	671
Cash and cash equivalents, end of period	17,551	27,463	46,344
Restricted cash, end of period	836	837	733
Cash and cash equivalents and restricted cash	18,387	28,300	47,077
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2022, 2021 and 2020 of $10,517, $8,689 and $4,650 respectively	85,761	72,391	79,498
Cash paid for income taxes	902	785	688
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,792	32,765	32,706
Extinguishment of debt costs accrued in financing activities	393	0	0
Change in investment in real estate ventures as a result of deconsolidation	107,057	32,761	0
Change in operating real estate from deconsolidation of operating properties	(92,009)	(30,073)	427,710
Change in investment in real estate ventures from deconsolidation of operating properties	0	0	(296,262)
Change in mortgage notes payable from deconsolidation of operating properties	0	0	(220,271)
Change in other assets as a result of deconsolidation of operating properties	(15,048)	(2,688)	1,471
Change in capital expenditures financed through accounts payable at period end	(6,135)	22,744	(9,949)
Change in capital expenditures financed through retention payable at period end	(7,165)	(613)	284
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	53,992	12,366	307,326
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	177,984	178,105	188,283
Amortization of deferred financing costs	3,091	2,836	2,904
Amortization of debt discount/(premium), net	(5,254)	(1,951)	(568)
Amortization of stock compensation costs	8,939	7,130	6,627
Straight-line rent income	(13,631)	(13,485)	(14,743)
Amortization of acquired above (below) market leases, net	(2,581)	(5,377)	(4,867)
Straight-line ground rent expense	814	918	1,455
Provision for doubtful accounts	0	0	1,049
Net gain on real estate venture transactions	(26,718)	(2,973)	(75)
Loss on promoted interest in unconsolidated real estate venture	0	0	0
Total gain on sale of real estate	(25,684)	(3,045)	(289,662)
Loss on early extinguishment of debt	435	0	0
Provision for impairment	4,663	0	0
Loss from unconsolidated real estate ventures, including income distributions	23,522	26,697	18,584
Income tax provision (benefit)	55	47	(224)
Changes in assets and liabilities:
Accounts receivable	1,328	2,506	(2,031)
Other assets	(1,120)	(19,325)	(5,034)
Accounts payable and accrued expenses	5,405	2,974	14,374
Deferred income, gains and rent	1,567	2,986	(12,149)
Other liabilities	2,500	465	14,557
Net cash provided by operating activities	209,307	190,874	225,806
Cash flows from investing activities:
Acquisition of properties	(3,446)	0	(41,950)
Proceeds from the sale of properties	64,210	10,303	278,114
Proceeds from insurance	0	1,250	0
Proceeds from note receivable	44,300	50,000	0
Issuance of note receivable	0	0	(50,000)
Capital expenditures for tenant improvements	(86,774)	(56,830)	(73,166)
Capital expenditures for redevelopments	(87,223)	(48,022)	(21,664)
Capital expenditures for developments	(89,017)	(30,269)	(65,420)
Advances for the purchase of tenant assets, net of repayments	(447)	270	1,488
Investment in unconsolidated real estate ventures	(47,428)	(31,643)	(719)
Deposits for real estate	(4,900)	(2,550)	0
Capital distributions from unconsolidated real estate ventures	46,898	27,028	9,001
Leasing costs paid	(26,762)	(19,852)	(17,394)
Net cash provided by (used in) investing activities	(190,589)	(100,315)	18,290
Cash flows from financing activities:
Repayments of mortgage notes payable	0	0	(94,993)
Proceeds from credit facility borrowings	478,000	154,000	318,000
Repayments of credit facility borrowings	(412,500)	(131,000)	(318,000)
Proceeds from unsecured notes	350,000	0	0
Repayments of unsecured notes	(296,134)	0	0
Debt financing costs paid	(9,875)	0	0
Exercise of stock options, net	0	(63)	47
Shares used for employee taxes upon vesting of share awards	(2,941)	(1,762)	(1,346)
Partner contributions to consolidated real estate venture	0	2,765	0
Repurchase and retirement of common shares	0	0	(60,000)
Redemption of limited partnership units	(4,006)	(2,334)	0
Distributions paid to preferred and common partnership units	(131,175)	(130,942)	(131,897)
Net cash used in financing activities	(28,631)	(109,336)	(288,189)
Decrease in cash and cash equivalents and restricted cash	(9,913)	(18,777)	(44,093)
Cash and cash equivalents and restricted cash at beginning of year	28,300	47,077	91,170
Cash and cash equivalents and restricted cash at end of period	18,387	28,300	47,077
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	27,463	46,344	90,499
Restricted cash, beginning of period	837	733	671
Cash and cash equivalents, end of period	17,551	27,463	46,344
Restricted cash, end of period	836	837	733
Cash and cash equivalents and restricted cash	18,387	28,300	47,077
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the years ended December 31, 2022, 2021 and 2020 of $10,517, $8,689 and $4,650 respectively	85,761	72,391	79,498
Cash paid for income taxes	902	785	688
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,792	32,765	32,706
Extinguishment of debt costs accrued in financing activities	393	0	0
Change in investment in real estate ventures as a result of deconsolidation	107,057	32,761	0
Change in operating real estate from deconsolidation of operating properties	(92,009)	(30,073)	427,710
Change in investment in real estate ventures from deconsolidation of operating properties	0	0	(296,262)
Change in mortgage notes payable from deconsolidation of operating properties	0	0	(220,271)
Change in other assets as a result of deconsolidation of operating properties	(15,048)	(2,688)	1,471
Change in capital expenditures financed through accounts payable at period end	(6,135)	22,744	(9,949)
Change in capital expenditures financed through retention payable at period end	$ (7,165)	$ (613)	$ 284