Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income		$ 32,270	$ 24,403
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements		31,565	27,233
Amortization of leasing costs, in-place lease intangibles and below market ground rents - operating leases		10,667	11,641
Accrued straight-line rental revenue		(3,434)	(2,893)
Amortization of leasing incentives and above or below-market rents		(593)	(287)
Amortization of right-of-use assets - finance leases		440	230
Accrued straight-line ground rent expense		54	(10)
Unrealized credit loss provision		227	0
Adjustment for uncollectable lease accounts		3,195	220
Noncash stock compensation		1,907	1,339
Impairment charges		205	0
Noncash interest expense		1,499	898
Interest expense on finance leases		686	340
Gain on real estate dispositions		(6,388)	(4,699)
Adjustment for Annapolis Junction loan discount amortization	[1]	0	(3,727)
Change in fair value of derivatives and other		1,424	3,926
Equity in income of unconsolidated real estate entities		0	(273)
Changes in operating assets and liabilities:
Property assets		(6,642)	(4,225)
Property liabilities		3,356	2,623
Construction assets		(8,328)	(3,452)
Construction liabilities		18,824	(642)
Interest receivable		(13,167)	(7,118)
Net cash provided by operating activities		67,767	45,527
INVESTING ACTIVITIES
Development of real estate investments		(52,157)	(107,458)
Tenant and building improvements		(8,195)	(16,889)
Acquisitions of real estate investments, net of cash received		(34,785)	(133,345)
Dispositions of real estate investments, net of selling costs		96,458	32,468
Notes receivable issuances		(17,687)	(44,531)
Notes receivable paydowns		16,220	16,965
Leasing costs		(2,438)	(2,569)
Leasing incentives		(1,289)	0
Contributions to equity method investments		0	(535)
Net cash used for investing activities		(3,873)	(255,894)
FINANCING ACTIVITIES
Proceeds from issuance of cumulative redeemable perpetual preferred stock, net		101,460	61,001
Proceeds from issuance of common stock, net		7,387	71,749
Common shares tendered for tax withholding		(534)	(344)
Debt issuances, credit facility and construction loan borrowings		81,004	349,157
Debt and credit facility repayments, including principal amortization		(181,182)	(200,879)
Debt issuance costs		(326)	(3,225)
Dividends and distributions		(36,058)	(43,537)
Net cash provided by (used for) financing activities		(28,249)	233,922
Net increase in cash and cash equivalents		35,645	23,555
Cash, cash equivalents, and restricted cash, beginning of period		43,579	24,051
Cash, cash equivalents, and restricted cash, end of period	[2]	79,224	47,606
Supplemental Disclosures (noncash transactions):
(Decrease) increase in dividends and distributions payable		(5,817)	3,949
(Decrease) increase in accrued capital improvements and development costs		(12,564)	(13,204)
Note payable issued in acquisition of noncontrolling interest in real estate investment		6,130	0
Issuance of operating partnership units for acquisitions		67	71,115
Operating Partnership units redeemed for common shares		8,530	2,700
Note payable recorded for mandatorily redeemable partnership interest		3,829	0
Debt assumed at fair value in conjunction with real estate purchases		22,512	101,390
Note receivable extinguished in conjunction with real estate purchase		0	31,252
Equity method investment redeemed for real estate acquisition		0	23,011
Noncontrolling interest in acquired real estate entity		0	4,870
Recognition of operating lease right-of-use assets (3)	[3]	0	33,965
Recognition of operating lease liabilities (3)	[3]	0	41,631
Recognition of finance lease right-of-use assets		0	24,500
Recognition of finance lease liabilities		0	17,871
De-recognition of operating lease right-of-use assets - lease termination		0	440
De-recognition of operating lease liabilities - lease termination		$ 0	$ 440

[1] Borrower paid $5.0 million in 2018 in exchange for the Company's purchase option, which was accounted for as a loan modification fee; interest income was recognized as additional interest income on the note receivable over the one-year then-remaining term.

[2] The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the Condensed Consolidated Statements of Cash Flows (in thousands):     September 30, 2020   September 30, 2019 Cash and cash equivalents   $ 73,579
  $ 44,195
Restricted cash ^(a)   5,645
  3,411
Cash, cash equivalents, and restricted cash   $ 79,224
  $ 47,606

(a) Restricted cash represents amounts held by lenders for real estate taxes, insurance, and reserves for capital improvements.

[3] Amounts attributable to 2019 are net of $0.4 million disposal related to the Company's preexisting lease at the Thames Street Wharf property acquired on June 26, 2019.