Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 48,015	$ 52,871
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	132,584	142,736
Amortization of deferred financing costs	1,807	2,063
Amortization of debt discount/(premium), net	1,069	1,108
Amortization of stock compensation costs	4,321	3,612
Straight-line rent income	(21,002)	(22,049)
Amortization of acquired above (below) market leases, net	(2,280)	(5,090)
Straight-line ground rent expense	66	66
Provision for doubtful accounts	1,622	573
Net gain on real estate venture transactions	(28,340)	(19,529)
Net gain on sale of interests in real estate	(9,364)	(114,813)
Loss on early extinguishment of debt	0	66,590
Provision for impairment	3,057	13,069
Other than temporary impairment	4,844	0
Real Estate Venture loss in excess of distributions	199	9,945
Deferred financing obligation	0	(681)
Income tax benefit	(1,133)	0
Changes in assets and liabilities:
Accounts receivable	(4,445)	4,041
Other assets	(8,927)	(10,332)
Accounts payable and accrued expenses	6,743	7,163
Deferred income, gains and rent	(3,160)	(2,000)
Other liabilities	2,107	318
Net cash provided by operating activities	127,783	129,661
Cash flows from investing activities:
Acquisition of properties	(34,748)	(20,406)
Proceeds from the sale of properties	114,821	758,931
Proceeds from real estate venture sales	59,022	20,551
Issuance of mortgage note receivable	0	(3,365)
Capital expenditures for tenant improvements	(44,902)	(37,991)
Capital expenditures for redevelopments	(21,951)	(10,852)
Capital expenditures for developments	(53,560)	(147,831)
Advances for the purchase of tenant assets, net of repayments	1,148	275
Investment in unconsolidated Real Estate Ventures	(5,243)	(27,174)
Deposits for real estate	605	(746)
Escrowed cash	0	6,993
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	14,906	12,565
Leasing costs paid	(12,553)	(12,884)
Net cash provided by investing activities	17,545	538,066
Cash flows from financing activities:
Proceeds from mortgage notes payable	0	86,900
Repayments of mortgage notes payable	(3,681)	(355,947)
Proceeds from credit facility borrowings	264,000	195,000
Repayments of credit facility borrowings	(86,000)	(195,000)
Repayments of unsecured notes	(300,000)	(149,919)
Debt financing costs paid	0	(477)
Redemption of preferred shares	(100,000)	0
Proceeds from the exercise of stock options	1,229	1,286
Shares used for employee taxes upon vesting of share awards	(674)	(879)
Partner contributions to consolidated real estate venture	85	73
Partner distributions from consolidated real estate venture	(46)	0
Distributions paid to shareholders	(88,162)	(85,702)
Distributions to non-controlling interest	(711)	(697)
Net cash used in financing activities	(313,960)	(505,362)
Increase (decrease) in cash and cash equivalents	(168,632)	162,365
Cash and cash equivalents at beginning of year	193,919	56,694
Cash and cash equivalents at end of period	25,287	219,059
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2017 and 2016 of $2,975 and $10,023, respectively	58,252	64,046
Cash paid for income taxes	225	0
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	28,391	30,036
Change in investment in real estate ventures as a result of dispositions	(30,584)	(2,023)
Change in investment in real estate ventures related to non-cash disposition of property	0	25,165
Change in real estate ventures as a result of other than temporary impairment	(4,844)	0
Change in operating real estate from deconsolidation of 3141 Fairview Park Drive	0	44,313
Change in investment in real estate ventures from deconsolidation of 3141 Fairview Park Drive	0	(12,642)
Change in mortgage notes payable from deconsolidation of 3141 Fairview Park Drive	0	(20,582)
Change in other liabilities from deconsolidation of 3141 Fairview Park Drive	0	(12,384)
Change in capital expenditures financed through accounts payable at period end	(1,455)	(5,012)
Change in capital expenditures financed through retention payable at period end	83	2,487
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	48,015	52,871
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	132,584	142,736
Amortization of deferred financing costs	1,807	2,063
Amortization of debt discount/(premium), net	1,069	1,108
Amortization of stock compensation costs	4,321	3,612
Straight-line rent income	(21,002)	(22,049)
Amortization of acquired above (below) market leases, net	(2,280)	(5,090)
Straight-line ground rent expense	66	66
Provision for doubtful accounts	1,622	573
Net gain on real estate venture transactions	(28,340)	(19,529)
Net gain on sale of interests in real estate	(9,364)	(114,813)
Loss on early extinguishment of debt	0	66,590
Provision for impairment	3,057	13,069
Other than temporary impairment	4,844	0
Real Estate Venture loss in excess of distributions	199	9,945
Deferred financing obligation	0	(681)
Income tax benefit	(1,133)	0
Changes in assets and liabilities:
Accounts receivable	(4,445)	4,041
Other assets	(8,927)	(10,332)
Accounts payable and accrued expenses	6,743	7,163
Deferred income, gains and rent	(3,160)	(2,000)
Other liabilities	2,107	318
Net cash provided by operating activities	127,783	129,661
Cash flows from investing activities:
Acquisition of properties	(34,748)	(20,406)
Proceeds from the sale of properties	114,821	758,931
Proceeds from real estate venture sales	59,022	20,551
Issuance of mortgage note receivable	0	(3,365)
Capital expenditures for tenant improvements	(44,902)	(37,991)
Capital expenditures for redevelopments	(21,951)	(10,852)
Capital expenditures for developments	(53,560)	(147,831)
Advances for the purchase of tenant assets, net of repayments	1,148	275
Investment in unconsolidated Real Estate Ventures	(5,243)	(27,174)
Deposits for real estate	605	(746)
Escrowed cash	0	6,993
Cash distribution from unconsolidated Real Estate Ventures in excess of cumulative equity income	14,906	12,565
Leasing costs paid	(12,553)	(12,884)
Net cash provided by investing activities	17,545	538,066
Cash flows from financing activities:
Proceeds from mortgage notes payable	0	86,900
Repayments of mortgage notes payable	(3,681)	(355,947)
Proceeds from credit facility borrowings	264,000	195,000
Repayments of credit facility borrowings	(86,000)	(195,000)
Repayments of unsecured notes	(300,000)	(149,919)
Debt financing costs paid	0	(477)
Redemption of preferred shares	(100,000)	0
Proceeds from the exercise of stock options	1,229	1,286
Shares used for employee taxes upon vesting of share awards	(674)	(879)
Partner contributions to consolidated real estate venture	85	73
Partner distributions from consolidated real estate venture	(46)	0
Distributions paid to shareholders	(88,873)	(86,399)
Net cash used in financing activities	(313,960)	(505,362)
Increase (decrease) in cash and cash equivalents	(168,632)	162,365
Cash and cash equivalents at beginning of year	193,919	56,694
Cash and cash equivalents at end of period	25,287	219,059
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2017 and 2016 of $2,975 and $10,023, respectively	58,252	64,046
Cash paid for income taxes	225	0
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	28,391	30,036
Change in investment in real estate ventures as a result of dispositions	(30,584)	(2,023)
Change in investment in real estate ventures related to non-cash disposition of property	0	25,165
Change in real estate ventures as a result of other than temporary impairment	(4,844)	0
Change in operating real estate from deconsolidation of 3141 Fairview Park Drive	0	44,313
Change in investment in real estate ventures from deconsolidation of 3141 Fairview Park Drive	0	(12,642)
Change in mortgage notes payable from deconsolidation of 3141 Fairview Park Drive	0	(20,582)
Change in other liabilities from deconsolidation of 3141 Fairview Park Drive	0	(12,384)
Change in capital expenditures financed through accounts payable at period end	(1,455)	(5,012)
Change in capital expenditures financed through retention payable at period end	$ 83	$ 2,487