Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 57,923	$ 25,874	$ 29,353
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including a below-market ground lease)	45,783	39,176	31,980
Amortization of deferred financing costs	1,938	2,100	2,239
Loss on the extinguishment of debt	0	11,883	326
Amortization of stock-based compensation	3,848	2,416	1,546
Straight-line rental income	(2,333)	(344)	(150)
Noncash interest income	(238)	(686)	(737)
(Gain) loss on sale of real estate	(2,051)	0	265
Interest income distribution from other real estate investment	0	1,500	0
Reserve for advances and deferred rent	0	10,414	0
Impairment of real estate investment	0	890	0
Change in operating assets and liabilities:
Accounts and other receivables, net	(3,800)	(9,428)	(3,404)
Prepaid expenses and other assets	(270)	(273)	84
Accounts payable and accrued liabilities	(1,443)	5,278	2,929
Net cash provided by operating activities	99,357	88,800	64,431
Cash flows from investing activities:
Acquisitions of real estate	(111,640)	(296,517)	(281,228)
Improvements to real estate	(7,230)	(748)	(762)
Purchases of equipment, furniture and fixtures	(1,782)	(403)	(151)
Preferred equity investments	0	0	(4,656)
Investment in real estate mortgage and other loans receivable	(5,648)	(12,416)	0
Principal payments received on real estate mortgage and other loans receivable	3,227	25	0
Sale of other real estate investment	0	7,500	0
Escrow deposits for acquisitions of real estate	(5,000)	0	(700)
Net proceeds from the sale of real estate	13,004	0	2,855
Net cash used in investing activities	(115,069)	(302,559)	(284,642)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	179,882	170,323	200,402
Proceeds from the issuance of senior unsecured notes payable	0	300,000	0
Proceeds from the issuance of senior unsecured term loan	0	0	100,000
Borrowings under unsecured revolving credit facility	65,000	238,000	255,000
Payments on senior unsecured notes payable	0	(267,639)	0
Payments on unsecured revolving credit facility	(135,000)	(168,000)	(205,000)
Payments on the mortgage notes payable	0	0	(95,022)
Payments of deferred financing costs	0	(6,063)	(1,352)
Net-settle adjustment on restricted stock	(1,288)	(866)	(515)
Dividends paid on common stock	(62,999)	(52,587)	(37,269)
Net cash provided by financing activities	45,595	213,168	216,244
Net increase (decrease) in cash and cash equivalents	29,883	(591)	(3,967)
Cash and cash equivalents, beginning of period	6,909	7,500	11,467
Cash and cash equivalents, end of period	36,792	6,909	7,500
Supplemental disclosures of cash flow information:
Interest paid	25,941	29,619	21,238
Supplemental schedule of noncash operating, investing and financing activities:
Increase in dividends payable	3,739	2,970	3,371
Application of escrow deposit to acquisition of real estate	$ 0	$ 700	$ 1,250