Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 80,867	$ 46,359	$ 57,923
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including below-market ground leases)	52,819	51,866	45,783
Amortization of deferred financing costs	1,950	2,003	1,938
Amortization of stock-based compensation	3,790	4,104	3,848
Straight-line rental income	(77)	(1,385)	(2,333)
Adjustment for collectibility of rental income	0	11,774	0
Noncash interest income	0	(797)	(238)
Loss (gain) on sale of real estate	37	(1,777)	(2,051)
Interest income distribution from other real estate investment	1,346	463	0
Impairment of real estate investments	0	16,692	0
Provision for loan losses	0	1,076	0
Change in operating assets and liabilities:
Accounts and other receivables, net	825	(6,283)	(3,800)
Prepaid expenses and other assets, net	387	(495)	(270)
Accounts payable and accrued liabilities	3,791	2,695	(1,443)
Net cash provided by operating activities	145,735	126,295	99,357
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied	(89,650)	(321,458)	(111,640)
Purchases of, and improvements to, equipment, furniture and fixtures and real estate	(8,297)	(6,289)	(9,012)
Investment in real estate mortgage and other loans receivable	(30,498)	(18,246)	(5,648)
Principal payments received on real estate mortgage and other loans receivable	80,928	24,283	3,227
Repayment of other real estate investment	2,327	2,204	0
Escrow deposits for potential acquisitions of real estate	(3,000)	0	(5,000)
Net proceeds from sales of real estate	6,608	3,499	13,004
Net cash used in investing activities	(41,582)	(316,007)	(115,069)
Cash flows from financing activities:
Proceeds from (costs paid for) the issuance of common stock, net	(404)
Proceeds from (costs paid for) the issuance of common stock, net		195,924	179,882
Proceeds from the issuance of senior unsecured term loan	0	200,000	0
Borrowings under unsecured revolving credit facility	65,000	243,000	65,000
Payments on senior unsecured term loan	0	(100,000)	0
Payments on unsecured revolving credit facility	(75,000)	(278,000)	(135,000)
Payments of deferred financing costs	0	(4,534)	0
Net-settle adjustment on restricted stock	(1,996)	(2,524)	(1,288)
Dividends paid on common stock	(93,161)	(80,619)	(62,999)
Net cash (used in) provided by financing activities	(105,561)	173,247	45,595
Net (decrease) increase in cash and cash equivalents	(1,408)	(16,465)	29,883
Cash and cash equivalents, beginning of period	20,327	36,792	6,909
Cash and cash equivalents, end of period	18,919	20,327	36,792
Supplemental disclosures of cash flow information:
Interest paid	21,691	26,005	25,941
Supplemental schedule of noncash investing and financing activities:
Increase in dividends payable	2,568	3,900	3,739
Right-of-use asset obtained in exchange for new operating lease obligation	599	1,010	0
Transfer of pre-acquisition costs to acquired assets	168	242	0
Sale of real estate settled with notes receivable	$ 32,400	$ 27,500	$ 0