Summarized Condensed Consolidating Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands		9 Months Ended
	Apr. 15, 2019	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net cash (used in) provided by operating activities		$ 95,158	$ 72,390
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(298,557)	(75,621)
Improvements to real estate		(1,230)	(5,401)
Purchases of equipment, furniture and fixtures		(2,926)	(1,262)
Investment in real estate mortgage and other loans receivable		(14,699)	(2,598)
Principal payments received on real estate mortgage and other loans receivable		11,959	893
Repayment of other real estate investment		2,204	0
Escrow deposits for acquisitions of real estate		(22,920)	(1,000)
Net proceeds from sales of real estate		218	13,004
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(325,951)	(71,985)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	$ 149,000	195,963	130,546
Proceeds from the issuance of senior unsecured term loan		200,000	0
Borrowings under unsecured revolving credit facility		235,000	60,000
Payments on unsecured revolving credit facility		(265,000)	(135,000)
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		(59,155)	(45,827)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		199,750	8,431
Net (decrease) increase in cash and cash equivalents		(31,043)	8,836
Cash and cash equivalents, beginning of period		36,792	6,909
Cash and cash equivalents, end of period		5,749	15,745
Reportable Legal Entities | Parent Guarantor
Cash flows from operating activities:
Net cash (used in) provided by operating activities		(114)	(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	0
Net proceeds from sales of real estate		0	0
Distribution from subsidiary		59,155	45,827
Intercompany financing		(193,325)	(129,251)
Net cash used in investing activities		(134,170)	(83,424)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		195,963	130,546
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		(59,155)	(45,827)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		134,284	83,431
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 (used in) provided by operating activities		39,195	28,087
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(86,393)	(75,621)
Improvements to real estate		(767)	(5,376)
Purchases of equipment, furniture and fixtures		(2,922)	(1,193)
Investment in real estate mortgage and other loans receivable		(14,699)	(2,598)
Principal payments received on real estate mortgage and other loans receivable		11,959	893
Repayment of other real estate investment		0
Escrow deposits for acquisitions of real estate		(22,920)	(1,000)
Net proceeds from sales of real estate		218	13,004
Distribution from subsidiary		0	0
Intercompany financing		(154,350)	44,216
Net cash used in investing activities		(269,874)	(27,675)
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		235,000	60,000
Payments on unsecured revolving credit facility		(265,000)	(135,000)
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		(59,155)	(45,827)
Intercompany financing		193,325	129,251
Net cash provided by financing activities		199,636	8,424
Net (decrease) increase in cash and cash equivalents		(31,043)	8,836
Cash and cash equivalents, beginning of period		36,792	6,909
Cash and cash equivalents, end of period		5,749	15,745
Reportable Legal Entities | Combined Subsidiary Guarantors
Cash flows from operating activities:
Net cash (used in) provided by operating activities		56,077	44,310
Cash flows from investing activities:
Acquisitions of real estate, net of deposits applied		(212,164)	0
Improvements to real estate		(463)	(25)
Purchases of equipment, furniture and fixtures		(4)	(69)
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	0
Net proceeds from sales of real estate		0	0
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(210,427)	(94)
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		154,350	(44,216)
Net cash provided by financing activities		154,350	(44,216)
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 (used in) 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	0
Net proceeds from sales of real estate		0	0
Distribution from subsidiary		(59,155)	(45,827)
Intercompany financing		347,675	85,035
Net cash used in investing activities		288,520	39,208
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		59,155	45,827
Intercompany financing		(347,675)	(85,035)
Net cash provided by financing activities		(288,520)	(39,208)
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