Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Net (loss) income	$ (5,774)	$ 37,044	$ 22,038
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation of building and building improvements	93,980	80,394	60,120
Amortization of leasing costs and intangibles, including ground leasehold interests and leasing costs	67,076	73,031	59,048
Amortization of below market leases, net	(2,292)	(3,201)	(685)
Amortization of deferred financing costs and debt premium	2,607	5,562	3,071
Amortization of swap interest	126	126	126
Deferred rent	(25,687)	(19,519)	(8,571)
Deferred rent, ground lease	2,065	1,640	0
Termination fee revenue - receivable from tenant, net	0	(6,000)	(3,114)
Gain from sale of depreciable operating property	(4,083)	(29,940)	(1,231)
Gain on fair value of earn-out	(2,657)	(1,461)	0
Unrealized loss on interest rate swap	0	0	2
Loss from investment in unconsolidated entities	2,071	5,307	2,254
Investment in unconsolidated entities valuation adjustment	4,453	0	0
Loss from investments	31	307	0
Impairment provision	23,472	30,734	0
Performance distribution allocation (non-cash)	0	(2,604)	0
Stock-based compensation	4,107	2,623	38
Change in operating assets and liabilities:
Deferred leasing costs and other assets	4,383	(7,775)	(13,503)
Restricted reserves	27	14	57
Accrued expenses and other liabilities	4,203	(9,505)	3,463
Due to affiliates, net	(3,570)	4,072	(2,254)
Net cash provided by operating activities	164,538	160,849	120,859
Investing Activities:
Cash acquired in connection with the EA Merger, net of acquisition costs	0	25,320	0
Acquisition of properties, net	(16,584)	(38,775)	(182,250)
Proceeds from disposition of properties	51,692	139,446	11,442
Real estate acquisition deposits	1,047	(1,047)	(3,350)
Reserves for tenant improvements		1,039
Reserves for tenant improvements	(1,530)		(357)
Payments for construction in progress	(58,938)	(46,346)	(24,398)
Investment in unconsolidated joint venture	(8,160)	0	(3,274)
Distributions of capital from investment in unconsolidated entities	8,531	14,603	7,691
Payments to Acquire Other Investments	(1,029)	(8,422)	0
Net cash (used in) provided by investing activities	(24,971)	85,818	(194,496)
Financing Activities:
Proceeds from borrowings - KeyBank Loans	0	627,000	0
Proceeds from borrowings - Revolver/KeyBank Loans	215,000	315,854	0
Proceeds from borrowings - Revolver Loan - EA-1	0	0	96,100
Principal payoff of secured indebtedness - Revolver Loan	(53,000)	(104,439)	0
Principal payoff of secured indebtedness - Mortgage Debt	0	0	(18,954)
Principal payoff of secured indebtedness - Unsecured Credit Facility - EA-1	0	(715,000)	(106,253)
Principal amortization payments on secured indebtedness	(7,362)	(6,577)	(6,494)
Deferred financing costs	(4,725)	(5,737)	(24)
Offering costs	(594)	(2,384)	(4,959)
Issuance of perpetual convertible preferred shares	0	0	125,000
Repurchase of common stock	(107,821)	(200,013)	(83,574)
Repurchase of noncontrolling interest	(1,137)	(53)	0
Issuance of common stock, net of discounts and underwriting costs	4,698	8,826	0
Repurchase of common shares to satisfy employee tax withholding requirements	(751)	0	0
Dividends paid on preferred units subject to redemption	(8,396)	(8,188)	(1,228)
Distributions to noncontrolling interests	(13,290)	(16,865)	(4,737)
Distributions to common stockholders	(72,143)	(90,116)	(71,822)
Net cash used in financing activities	(49,521)	(197,692)	(76,945)
Net increase (decrease) in cash, cash equivalents and restricted cash	90,046	48,975	(150,582)
Cash, cash equivalents and restricted cash at the beginning of the period	113,260	64,285	214,867
Cash, cash equivalents and restricted cash at the end of the period	203,306	113,260	64,285
Supplemental disclosure of cash flow information:
Cash paid for interest	80,155	65,040	50,736
Supplemental disclosures of non-cash investing and financing transactions:
Goodwill -Self Administration Transaction	0	0	229,948
Affiliates - receivables and other related party assets acquired in Self Administration Transaction	0	0	19,878
Distributions payable to common stockholders	6,864	13,035	9,799
Distributions payable to noncontrolling interests	943	1,758	402
Common stock issued pursuant to the distribution reinvestment plan	24,497	41,060	40,838
Common stock redemptions funded subsequent to period-end	(5,345)	96,648	0
Issuance of stock dividends	5,747	14,139	0
Mortgage debt assumed in conjunction with the acquisition of real estate assets plus a premium of $109	18,884	0	0
Payable for construction in progress	472	0	0
Accrued tenant obligations	30,011	11,802	0
Limited partnership units issued in exchange for net assets acquired in Self Administration Transaction	0	25,000	205,000
Due to affiliates- Self Administration Transaction	0	0	41,114
Other liabilities assumed in Self Administration Transaction	0	0	7,951
Decrease in fair value swap agreement	(29,704)	(22,303)	(5,427)
Decrease in stockholder servicing fee payable	(1,388)	0	0
Net assets acquired in Merger in exchange for common shares	0	751,277	0
Implied EA-1 common stock and operating partnership units issued in exchange for net assets acquired in Merger	0	751,277	0
Operating lease right-of-use assets obtained in exchange for lease liabilities upon adoption of ASC 842		16,919
Distributions to redeemable noncontrolling interests attributable to common stockholders as reflected on the consolidated statements of operations	$ 0	$ 0	$ 355