Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 14,579	$ 48,015
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	130,908	132,584
Amortization of deferred financing costs	1,872	1,807
Amortization of debt discount/(premium), net	527	1,069
Amortization of stock compensation costs	5,143	4,321
Straight-line rent income	(10,102)	(21,002)
Amortization of acquired above (below) market leases, net	(2,313)	(2,280)
Straight-line ground rent expense	231	66
Provision for doubtful accounts	1,238	1,622
Net gain on real estate venture transactions	(37,263)	(28,340)
Net gain on sale of interests in real estate	(2,824)	(9,364)
Provision for impairment	56,865	3,057
Other than temporary impairment	0	4,844
Income from Real Estate Ventures, net of distributions	2,811	199
Income tax provision (benefit)	158	(1,133)
Changes in assets and liabilities:
Accounts receivable	4,165	(4,445)
Other assets	(9,831)	(8,361)
Accounts payable and accrued expenses	1,544	6,743
Deferred income, gains and rent	(3,461)	(3,160)
Other liabilities	290	2,107
Net cash provided by operating activities	154,537	128,349
Cash flows from investing activities:
Acquisition of properties	(40,240)	(34,748)
Proceeds from the sale of properties	16,771	114,821
Proceeds from real estate venture sales	42,953	59,022
Issuance of mortgage note receivable	(44,430)	0
Proceeds from repayment of mortgage notes receivable	141	0
Capital expenditures for tenant improvements	(43,142)	(44,902)
Capital expenditures for redevelopments	(31,312)	(21,951)
Capital expenditures for developments	(70,297)	(53,560)
Advances for the purchase of tenant assets, net of repayments	739	1,148
Investment in unconsolidated Real Estate Ventures	(646)	(5,243)
Deposits for real estate	(5,550)	605
Capital distributions from Real Estate Ventures	5,101	14,906
Leasing costs paid	(10,664)	(12,553)
Net cash (used in) provided by investing activities	(180,576)	17,545
Cash flows from financing activities:
Repayments of mortgage notes payable	(4,972)	(3,681)
Proceeds from credit facility borrowings	0	264,000
Repayments of credit facility borrowings	0	(86,000)
Repayments of unsecured notes	0	(300,000)
Debt financing costs paid	(2,704)	0
Redemption of preferred shares	0	(100,000)
Proceeds from the exercise of stock options	0	1,229
Proceeds from the issuance of common shares	416	0
Shares used for employee taxes upon vesting of share awards	(1,494)	(674)
Partner contributions to consolidated real estate venture	15	85
Partner distributions from consolidated real estate venture	(54)	(46)
Distributions paid to shareholders	(96,626)	(88,162)
Distributions to noncontrolling interest	(799)	(711)
Net cash used in financing activities	(106,218)	(313,960)
Decrease in cash and cash equivalents and restricted cash	(132,257)	(168,066)
Cash and cash equivalents and restricted cash at beginning of year	203,442	194,618
Cash and cash equivalents and restricted cash at end of period	71,185	26,552
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2018 and 2017 of $2,578 and $2,975, respectively	52,888	58,252
Cash paid for income taxes	405	225
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,492	28,391
Change in construction-in-progress related to non-cash disposition of land	22,625	0
Change in deferred income, gains and rent to the non-cash disposition of land	(25,462)	0
Change in investment in real estate ventures as a result of dispositions	(17,313)	(30,584)
Change in real estate ventures as a result of other than temporary impairment	0	(4,844)
Change in operating real estate related to a non-cash acquisition of an operating property	(20,653)	0
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,144)	0
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	182	0
Change in investments in joint venture related to non-cash acquisition of property	(2,042)	0
Change in mortgage notes payable related to acquisition of an operating property	9,940	0
Change in capital expenditures financed through accounts payable at period end	992	(1,455)
Change in capital expenditures financed through retention payable at period end	2,352	83
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	14,579	48,015
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	130,908	132,584
Amortization of deferred financing costs	1,872	1,807
Amortization of debt discount/(premium), net	527	1,069
Amortization of stock compensation costs	5,143	4,321
Straight-line rent income	(10,102)	(21,002)
Amortization of acquired above (below) market leases, net	(2,313)	(2,280)
Straight-line ground rent expense	231	66
Provision for doubtful accounts	1,238	1,622
Net gain on real estate venture transactions	(37,263)	(28,340)
Net gain on sale of interests in real estate	(2,824)	(9,364)
Provision for impairment	56,865	3,057
Other than temporary impairment	0	4,844
Income from Real Estate Ventures, net of distributions	2,811	199
Income tax provision (benefit)	158	(1,133)
Changes in assets and liabilities:
Accounts receivable	4,165	(4,445)
Other assets	(9,831)	(8,361)
Accounts payable and accrued expenses	1,544	6,743
Deferred income, gains and rent	(3,461)	(3,160)
Other liabilities	290	2,107
Net cash provided by operating activities	154,537	128,349
Cash flows from investing activities:
Acquisition of properties	(40,240)	(34,748)
Proceeds from the sale of properties	16,771	114,821
Proceeds from real estate venture sales	42,953	59,022
Issuance of mortgage note receivable	(44,430)	0
Proceeds from repayment of mortgage notes receivable	141	0
Capital expenditures for tenant improvements	(43,142)	(44,902)
Capital expenditures for redevelopments	(31,312)	(21,951)
Capital expenditures for developments	(70,297)	(53,560)
Advances for the purchase of tenant assets, net of repayments	739	1,148
Investment in unconsolidated Real Estate Ventures	(646)	(5,243)
Deposits for real estate	(5,550)	605
Capital distributions from Real Estate Ventures	5,101	14,906
Leasing costs paid	(10,664)	(12,553)
Net cash (used in) provided by investing activities	(180,576)	17,545
Escrowed cash	0	0
Cash flows from financing activities:
Repayments of mortgage notes payable	(4,972)	(3,681)
Proceeds from credit facility borrowings	0	264,000
Repayments of credit facility borrowings	0	(86,000)
Repayments of unsecured notes	0	(300,000)
Debt financing costs paid	(2,704)
Redemption of preferred shares	0	(100,000)
Proceeds from the exercise of stock options	0	1,229
Proceeds from the issuance of common shares	416	0
Shares used for employee taxes upon vesting of share awards	(1,494)	(674)
Partner contributions to consolidated real estate venture	15	85
Partner distributions from consolidated real estate venture	(54)	(46)
Distributions paid to shareholders	(97,425)	(88,873)
Net cash used in financing activities	(106,218)	(313,960)
Decrease in cash and cash equivalents and restricted cash	(132,257)	(168,066)
Cash and cash equivalents and restricted cash at beginning of year	203,442	194,618
Cash and cash equivalents and restricted cash at end of period	71,185	26,552
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2018 and 2017 of $2,578 and $2,975, respectively	52,888	58,252
Cash paid for income taxes	405	225
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,492	28,391
Change in construction-in-progress related to non-cash disposition of land	22,625	0
Change in deferred income, gains and rent to the non-cash disposition of land	(25,462)	0
Change in investment in real estate ventures as a result of dispositions	(17,313)	(30,584)
Change in real estate ventures as a result of other than temporary impairment	0	(4,844)
Change in operating real estate related to a non-cash acquisition of an operating property	(20,653)	0
Change in intangible assets, net related to non-cash acquisition of an operating property	(3,144)	0
Change in acquired lease intangibles, net related to non-cash acquisition of an operating property	182	0
Change in investments in joint venture related to non-cash acquisition of property	(2,042)	0
Change in mortgage notes payable related to acquisition of an operating property	9,940	0
Change in capital expenditures financed through accounts payable at period end	992	(1,455)
Change in capital expenditures financed through retention payable at period end	$ 2,352	$ 83