Summarized Condensed Consolidating Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands		6 Months Ended
	Apr. 15, 2019	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net cash provided by operating activities		$ 61,738	$ 42,116
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(285,946)	(47,310)
Improvements to real estate		(68)	(506)
Purchases of equipment, furniture and fixtures		(2,613)	(702)
Investment in real estate mortgage and other loans receivable		(11,389)	(1,390)
Principal payments received on real estate mortgage and other loans receivable		482	58
Repayment of other real estate investment		2,204	0
Escrow deposits for acquisitions of real estate		0	(2,250)
Net proceeds from the sale of real estate		131	13,004
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(297,199)	(39,096)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	$ 149,000	196,041	47,547
Proceeds from the issuance of senior unsecured term loan		200,000	0
Borrowings under unsecured revolving credit facility		195,000	60,000
Payments on unsecured revolving credit facility		(245,000)	(75,000)
Payments on senior unsecured term loan		(100,000)	0
Payments of deferred financing costs		(4,534)	0
Net-settle adjustment on restricted stock		(2,524)	(1,288)
Dividends paid on common stock		(37,685)	(29,628)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		201,298	1,631
Net (decrease) increase in cash and cash equivalents		(34,163)	4,651
Cash and cash equivalents, beginning of period		36,792	6,909
Cash and cash equivalents, end of period		2,629	11,560
Reportable Legal Entities | Parent Guarantor
Cash flows from operating activities:
Net cash provided by operating activities		0	(7)
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		0	0
Improvements to real estate		0	0
Purchases of equipment, furniture and fixtures		0	0
Investment in real estate mortgage and other loans receivable		0	0
Principal payments received on real estate mortgage and other loans receivable		0	0
Repayment of other real estate investment		0
Escrow deposits for acquisitions of real estate			0
Net proceeds from the sale of real estate		0	0
Distribution from subsidiary		37,685	29,628
Intercompany financing		(193,517)	(46,252)
Net cash used in investing activities		(155,832)	(16,624)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		196,041	47,547
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under unsecured revolving credit facility		0	0
Payments on unsecured revolving credit facility		0	0
Payments on senior unsecured term loan		0
Payments of deferred financing costs		0
Net-settle adjustment on restricted stock		(2,524)	(1,288)
Dividends paid on common stock		(37,685)	(29,628)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		155,832	16,631
Net (decrease) increase in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0
Cash and cash equivalents, end of period		0	0
Reportable Legal Entities | Issuers
Cash flows from operating activities:
Net cash provided by operating activities		25,720	12,758
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(73,782)	(47,310)
Improvements to real estate		(51)	(495)
Purchases of equipment, furniture and fixtures		(2,610)	(645)
Investment in real estate mortgage and other loans receivable		(11,389)	(1,390)
Principal payments received on real estate mortgage and other loans receivable		482	58
Repayment of other real estate investment		0
Escrow deposits for acquisitions of real estate			(2,250)
Net proceeds from the sale of real estate		131	13,004
Distribution from subsidiary		0	0
Intercompany financing		(173,962)	29,297
Net cash used in investing activities		(261,181)	(9,731)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0	0
Proceeds from the issuance of senior unsecured term loan		200,000
Borrowings under unsecured revolving credit facility		195,000	60,000
Payments on unsecured revolving credit facility		(245,000)	(75,000)
Payments on senior unsecured term loan		(100,000)
Payments of deferred financing costs		(4,534)
Net-settle adjustment on restricted stock		0	0
Dividends paid on common stock		0	0
Distribution to Parent		(37,685)	(29,628)
Intercompany financing		193,517	46,252
Net cash provided by financing activities		201,298	1,624
Net (decrease) increase in cash and cash equivalents		(34,163)	4,651
Cash and cash equivalents, beginning of period		36,792	6,909
Cash and cash equivalents, end of period		2,629	11,560
Reportable Legal Entities | Combined Subsidiary Guarantors
Cash flows from operating activities:
Net cash provided by operating activities		36,018	29,365
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(212,164)	0
Improvements to real estate		(17)	(11)
Purchases of equipment, furniture and fixtures		(3)	(57)
Investment in real estate mortgage and other loans receivable		0	0
Principal payments received on real estate mortgage and other loans receivable		0	0
Repayment of other real estate investment		2,204
Escrow deposits for acquisitions of real estate			0
Net proceeds from the sale of real estate		0	0
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(209,980)	(68)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0	0
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under unsecured revolving credit facility		0	0
Payments on unsecured revolving credit facility		0	0
Payments on senior unsecured term loan		0
Payments of deferred financing costs		0
Net-settle adjustment on restricted stock		0	0
Dividends paid on common stock		0	0
Distribution to Parent		0	0
Intercompany financing		173,962	(29,297)
Net cash provided by financing activities		173,962	(29,297)
Net (decrease) increase in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0
Cash and cash equivalents, end of period		0	0
Elimination
Cash flows from operating activities:
Net cash provided by operating activities		0	0
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		0	0
Improvements to real estate		0	0
Purchases of equipment, furniture and fixtures		0	0
Investment in real estate mortgage and other loans receivable		0	0
Principal payments received on real estate mortgage and other loans receivable		0	0
Repayment of other real estate investment		0
Escrow deposits for acquisitions of real estate			0
Net proceeds from the sale of real estate		0	0
Distribution from subsidiary		(37,685)	(29,628)
Intercompany financing		367,479	16,955
Net cash used in investing activities		329,794	(12,673)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0	0
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under unsecured revolving credit facility		0	0
Payments on unsecured revolving credit facility		0	0
Payments on senior unsecured term loan		0
Payments of deferred financing costs		0
Net-settle adjustment on restricted stock		0	0
Dividends paid on common stock		0	0
Distribution to Parent		37,685	29,628
Intercompany financing		(367,479)	(16,955)
Net cash provided by financing activities		(329,794)	12,673
Net (decrease) increase in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0
Cash and cash equivalents, end of period		$ 0	$ 0