CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net income (loss)	$ 11,570	$ (5,774)	$ 37,044
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of building and building improvements	125,388	93,980	80,394
Amortization of leasing costs and intangibles, including ground leasehold interests and leasing costs	85,502	67,076	73,031
Amortization of below market leases, net	(1,323)	(2,292)	(3,201)
Amortization of deferred financing costs and debt premium	3,593	2,607	5,562
Amortization of swap interest	126	126	126
Deferred rent	(8,718)	(25,687)	(19,519)
Deferred rent, ground lease	0	2,065	1,640
Termination fee revenue - receivable from tenant, net	0	0	(6,000)
Write-off reserves	(1,166)	0	0
(Gain)/loss from sale of depreciable operating property	326	(4,083)	(29,940)
Gain on fair value of earn-out	(65)	(2,657)	(1,461)
(Income) loss from investment in unconsolidated entities	(8)	2,071	5,307
Investment in unconsolidated entities valuation adjustment	0	4,453	0
Loss from investments	125	31	307
Impairment provision	4,242	23,472	30,734
Performance distribution allocation (non-cash)	0	0	(2,604)
Stock-based compensation	7,469	4,107	2,623
Change in operating assets and liabilities:
Deferred leasing costs and other assets	(13,938)	4,383	(7,775)
Restricted reserves	(490)	27	14
Accrued expenses and other liabilities	(8,003)	4,203	(9,505)
Due to affiliates, net	349	(3,570)	4,072
Net cash provided by operating activities	204,979	164,538	160,849
Investing Activities:
Cash acquired in connection with the Company Merger, net of acquisition costs	(36,746)	0	25,320
Acquisition of properties, net	0	(16,584)	(38,775)
Proceeds from disposition of properties	22,408	51,692	139,446
Restricted reserves	1,078	(1,530)	0
Real estate acquisition deposits	0	1,047	(1,047)
Reserves for tenant improvements	0	0
Reserves for tenant improvements			1,039
Payments for construction in progress	(49,260)	(58,938)	(46,346)
Investment in unconsolidated joint venture	0	(8,160)	0
Distributions of capital from investment in unconsolidated entities	42	8,531	14,603
Purchase of investments	(332)	(1,029)	(8,422)
Net cash (used in) provided by investing activities	(62,810)	(24,971)	85,818
Financing Activities:
Proceeds from borrowings - KeyBank Loans	0	0	627,000
Proceeds from borrowings - Revolver/KeyBank Loans	0	215,000	315,854
Proceeds from borrowings - Term Loan	400,000	0	0
Principal payoff of indebtedness - CCIT II Credit Facility	(415,500)	0	0
Principal payoff of secured indebtedness - Revolver Loan	0	(53,000)	(104,439)
Principal payoff of secured indebtedness - Mortgage Debt	(1,292)	0	0
Principal payoff of Unsecured Credit Facility - EA-1	0	0	(715,000)
Principal amortization payments on secured indebtedness	(9,786)	(7,362)	(6,577)
Deferred financing costs	(567)	(4,725)	(5,737)
Offering costs	(47)	(594)	(2,384)
Repurchase of common stock	(25,517)	(107,821)	(200,013)
Repurchase of noncontrolling interest	0	(1,137)	(53)
Issuance of common stock, net of discounts and underwriting costs	0	4,698	8,826
Repurchase of common shares to satisfy employee tax withholding requirements	(2,874)	(751)	0
Dividends paid on preferred units subject to redemption	(9,542)	(8,396)	(8,188)
Distributions to noncontrolling interests	(11,134)	(13,290)	(16,865)
Distributions to common stockholders	(82,976)	(72,143)	(90,116)
Financing lease payment	(100)	0	0
Net cash used in financing activities	(159,335)	(49,521)	(197,692)
Net (decrease) increase in cash, cash equivalents and restricted cash	(17,166)	90,046	48,975
Cash, cash equivalents and restricted cash at the beginning of the period	203,306	113,260	64,285
Cash, cash equivalents and restricted cash at the end of the period	186,140	203,306	113,260
Supplemental disclosure of cash flow information:
Cash paid for interest	80,958	80,155	65,040
Supplemental disclosures of non-cash investing and financing transactions:
Distributions payable to common stockholders	9,672	6,864	13,035
Distributions payable to noncontrolling interests	946	943	1,758
Common stock issued pursuant to the distribution reinvestment plan	22,886	24,497	41,060
Common stock redemptions funded subsequent to period-end	0	5,345	96,648
Issuance of stock dividends	0	5,747	14,139
Mortgage debt assumed in conjunction with the acquisition of real estate assets plus a premium	0	18,884	0
Accrued for construction in progress	1,114	472	0
Accrued tenant obligations	10,123	30,011	11,802
Limited partnership units issued in exchange for net assets acquired in Self Administration Transaction	0	0	25,000
Change in fair value swap agreement	32,449	(29,704)	(22,303)
Decrease in stockholder servicing fee payable	0	(1,388)	0
Net assets acquired in mergers	838,315		751,277
Implied common stock and operating partnership units issued in exchange for net assets acquired in Mergers	838,315	0	751,277
Operating lease right-of-use assets obtained in exchange for lease liabilities upon adoption of ASC 842			16,919
Capitalized transaction costs paid in prior period	$ 2,170	$ 0	$ 0