Summarized Condensed Consolidating Information - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Real estate investments, net	$ 1,414,200	$ 1,216,237
Other real estate investments, net	33,300	18,045
Assets held for sale, net	34,590	0
Cash and cash equivalents	20,327	36,792	$ 6,909
Accounts and other receivables, net	2,571	11,387
Prepaid expenses and other assets	10,850	8,668
Deferred financing costs, net	3,023	633
Investment in subsidiaries	0	0
Intercompany	0	0
Total assets	1,518,861	1,291,762
Liabilities and Equity:
Senior unsecured notes payable, net	295,911	295,153
Senior unsecured term loan, net	198,713	99,612
Unsecured revolving credit facility	60,000	95,000
Accounts payable and accrued liabilities	14,962	15,967
Dividends payable	21,684	17,783
Intercompany	0	0
Total liabilities	591,270	523,515
Equity:
Common stock, $0.01 par value; 500,000,000 shares authorized, 95,103,270 and 85,867,044 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively	951	859
Additional paid-in capital	1,162,990	965,578
Cumulative distributions in excess of earnings	(236,350)	(198,190)
Total equity	927,591	768,247	594,617	$ 452,430
Total liabilities and equity	1,518,861	1,291,762
Reportable Legal Entities | Parent Guarantor
Assets:
Real estate investments, net	0	0
Other real estate investments, net	0	0
Assets held for sale, net	0
Cash and cash equivalents	0	0	0
Accounts and other receivables, net	0	0
Prepaid expenses and other assets	0	0
Deferred financing costs, net	0	0
Investment in subsidiaries	949,275	786,030
Intercompany	0	0
Total assets	949,275	786,030
Liabilities and Equity:
Senior unsecured notes payable, net	0	0
Senior unsecured term loan, net	0	0
Unsecured revolving credit facility	0	0
Accounts payable and accrued liabilities	0	0
Dividends payable	21,684	17,783
Intercompany	0	0
Total liabilities	21,684	17,783
Equity:
Common stock, $0.01 par value; 500,000,000 shares authorized, 95,103,270 and 85,867,044 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		859
Additional paid-in capital		965,578
Cumulative distributions in excess of earnings		(198,190)
Total equity	927,591	768,247
Total liabilities and equity	949,275	786,030
Reportable Legal Entities | Issuers
Assets:
Real estate investments, net	894,830	887,921
Other real estate investments, net	29,500	12,299
Assets held for sale, net	34,590
Cash and cash equivalents	20,327	36,792	6,909
Accounts and other receivables, net	2,549	9,359
Prepaid expenses and other assets	10,847	8,666
Deferred financing costs, net	3,023	633
Investment in subsidiaries	541,019	484,955
Intercompany	0	0
Total assets	1,536,685	1,440,625
Liabilities and Equity:
Senior unsecured notes payable, net	295,911	295,153
Senior unsecured term loan, net	198,713	99,612
Unsecured revolving credit facility	60,000	95,000
Accounts payable and accrued liabilities	13,491	13,588
Dividends payable	0	0
Intercompany	19,295	151,242
Total liabilities	587,410	654,595
Equity:
Common stock, $0.01 par value; 500,000,000 shares authorized, 95,103,270 and 85,867,044 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		0
Additional paid-in capital		661,686
Cumulative distributions in excess of earnings		124,344
Total equity	949,275	786,030
Total liabilities and equity	1,536,685	1,440,625
Reportable Legal Entities | Combined Subsidiary Guarantors
Assets:
Real estate investments, net	519,370	328,316
Other real estate investments, net	3,800	5,746
Assets held for sale, net	0
Cash and cash equivalents	0	0	0
Accounts and other receivables, net	22	2,028
Prepaid expenses and other assets	3	2
Deferred financing costs, net	0	0
Investment in subsidiaries	0	0
Intercompany	19,295	151,242
Total assets	542,490	487,334
Liabilities and Equity:
Senior unsecured notes payable, net	0	0
Senior unsecured term loan, net	0	0
Unsecured revolving credit facility	0	0
Accounts payable and accrued liabilities	1,471	2,379
Dividends payable	0	0
Intercompany	0	0
Total liabilities	1,471	2,379
Equity:
Common stock, $0.01 par value; 500,000,000 shares authorized, 95,103,270 and 85,867,044 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		0
Additional paid-in capital		321,761
Cumulative distributions in excess of earnings		163,194
Total equity	541,019	484,955
Total liabilities and equity	542,490	487,334
Elimination
Assets:
Real estate investments, net	0	0
Other real estate investments, net	0	0
Assets held for sale, net	0
Cash and cash equivalents	0	0	$ 0
Accounts and other receivables, net	0	0
Prepaid expenses and other assets	0	0
Deferred financing costs, net	0	0
Investment in subsidiaries	(1,490,294)	(1,270,985)
Intercompany	(19,295)	(151,242)
Total assets	(1,509,589)	(1,422,227)
Liabilities and Equity:
Senior unsecured notes payable, net	0	0
Senior unsecured term loan, net	0	0
Unsecured revolving credit facility	0	0
Accounts payable and accrued liabilities	0	0
Dividends payable	0	0
Intercompany	(19,295)	(151,242)
Total liabilities	(19,295)	(151,242)
Equity:
Common stock, $0.01 par value; 500,000,000 shares authorized, 95,103,270 and 85,867,044 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		0
Additional paid-in capital		(983,447)
Cumulative distributions in excess of earnings		(287,538)
Total equity	(1,490,294)	(1,270,985)
Total liabilities and equity	$ (1,509,589)	$ (1,422,227)