Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Capital in Excess of Par	Accumulated Deficit	Net Parent Investment	SMTA Preferred Shares	SubREIT Preferred Shares
Beginning Balance at Dec. 31, 2017	$ 0					$ 0	$ 0
Beginning Balance (in shares) at Dec. 31, 2017						0	0
Ending Balance at Mar. 31, 2018	0					$ 0	$ 0
Ending Balance (in shares) at Mar. 31, 2018						0	0
Beginning Balance at Dec. 31, 2017	390,918	$ 0	$ 0	$ 0	$ 390,918
Beginning Balance (in shares) at Dec. 31, 2017		0
Shareholders' Equity
Net income (loss)	(7,579)				(7,579)
Contributions from parent company	49,819				49,819
Distributions to parent company	(158,396)				(158,396)
Ending Balance at Mar. 31, 2018	274,762	$ 0	0	0	274,762
Ending Balance (in shares) at Mar. 31, 2018		0
Beginning Balance at Dec. 31, 2017	0					$ 0	$ 0
Beginning Balance (in shares) at Dec. 31, 2017						0	0
Ending Balance at Sep. 30, 2018	155,000					$ 150,000	$ 5,000
Ending Balance (in shares) at Sep. 30, 2018						6,000,000	5,000
Beginning Balance at Dec. 31, 2017	390,918	$ 0	0	0	390,918
Beginning Balance (in shares) at Dec. 31, 2017		0
Shareholders' Equity
Net income (loss)	(10,174)
Dividends declared on common shares	(14,200)
Ending Balance at Sep. 30, 2018	181,037	$ 430	200,448	(19,841)	0
Ending Balance (in shares) at Sep. 30, 2018		43,000,862
Beginning Balance at Mar. 31, 2018	0					$ 0	$ 0
Beginning Balance (in shares) at Mar. 31, 2018						0	0
Redeemable Preferred Equity
Issuance of preferred shares, net	155,000					$ 150,000	$ 5,000
Issuance of preferred shares, net (in shares)						6,000,000	5,000
Ending Balance at Jun. 30, 2018	155,000					$ 150,000	$ 5,000
Ending Balance (in shares) at Jun. 30, 2018						6,000,000	5,000
Beginning Balance at Mar. 31, 2018	274,762	$ 0	0	0	274,762
Beginning Balance (in shares) at Mar. 31, 2018		0
Shareholders' Equity
Net income (loss)	979			3,223	(2,244)
Contributions from parent company	124,696				124,696
Distributions to parent company	(41,787)				(41,787)
Issuance of shares of common stock, net		$ 429	199,998		(200,427)
Issuance of shares of common stock, net (in shares)		42,851,010
Issuance of preferred shares, net	(155,000)				(155,000)
Dividends declared on preferred shares	(1,325)			(1,325)
Ending Balance at Jun. 30, 2018	202,325	$ 429	199,998	1,898	0
Ending Balance (in shares) at Jun. 30, 2018		42,851,010
Ending Balance at Sep. 30, 2018	155,000					$ 150,000	$ 5,000
Ending Balance (in shares) at Sep. 30, 2018						6,000,000	5,000
Shareholders' Equity
Net income (loss)	(3,574)			(3,574)
Dividends declared on common shares	(14,190)			(14,190)
Dividends declared on preferred shares	(3,975)			(3,975)
Share-based compensation, net	451	$ 1	450
Share-based compensation, net (in shares)		149,852
Ending Balance at Sep. 30, 2018	181,037	$ 430	200,448	(19,841)	0
Ending Balance (in shares) at Sep. 30, 2018		43,000,862
Beginning Balance at Dec. 31, 2018	155,125					$ 150,000	$ 5,125
Beginning Balance (in shares) at Dec. 31, 2018						6,000,000	5,125
Ending Balance at Mar. 31, 2019	155,125					$ 150,000	$ 5,125
Ending Balance (in shares) at Mar. 31, 2019						6,000,000	5,125
Beginning Balance at Dec. 31, 2018	(89,585)	$ 430	201,056	(291,071)	0
Beginning Balance (in shares) at Dec. 31, 2018		43,000,862
Shareholders' Equity
Net income (loss)	(38,270)			(38,270)
Issuance of preferred shares, net	(25)		(25)
Dividends declared on common shares	(14,218)			(14,218)
Dividends declared on preferred shares	(3,975)			(3,975)
Share-based compensation, net	785	$ 1	793	(9)
Share-based compensation, net (in shares)		89,513
Tax withholdings related to net stock settlements	(36)			(36)
Tax withholdings related to net stock settlements (in shares)		(4,624)
Ending Balance at Mar. 31, 2019	(145,324)	$ 431	201,824	(347,579)	0
Ending Balance (in shares) at Mar. 31, 2019		43,085,751
Beginning Balance at Dec. 31, 2018	155,125					$ 150,000	$ 5,125
Beginning Balance (in shares) at Dec. 31, 2018						6,000,000	5,125
Ending Balance at Aug. 31, 2019	155,125					$ 150,000	$ 5,125
Ending Balance (in shares) at Aug. 31, 2019						6,000,000	5,125
Beginning Balance at Dec. 31, 2018	(89,585)	$ 430	201,056	(291,071)	0
Beginning Balance (in shares) at Dec. 31, 2018		43,000,862
Shareholders' Equity
Net income (loss)	(56,847)
Ending Balance at Aug. 31, 2019	(184,178)	$ 432	202,434	(387,044)	0
Ending Balance (in shares) at Aug. 31, 2019		43,159,931
Beginning Balance at Dec. 31, 2018	155,125					$ 150,000	$ 5,125
Beginning Balance (in shares) at Dec. 31, 2018						6,000,000	5,125
Beginning Balance at Dec. 31, 2018	(89,585)	$ 430	201,056	(291,071)	0
Beginning Balance (in shares) at Dec. 31, 2018		43,000,862
Shareholders' Equity
Dividends declared on common shares	(28,500)
Beginning Balance at Mar. 31, 2019	155,125					$ 150,000	$ 5,125
Beginning Balance (in shares) at Mar. 31, 2019						6,000,000	5,125
Ending Balance at Jun. 30, 2019	155,125					$ 150,000	$ 5,125
Ending Balance (in shares) at Jun. 30, 2019						6,000,000	5,125
Beginning Balance at Mar. 31, 2019	(145,324)	$ 431	201,824	(347,579)	0
Beginning Balance (in shares) at Mar. 31, 2019		43,085,751
Shareholders' Equity
Net income (loss)	(16,566)			(16,566)
Dividends declared on common shares	(14,243)			(14,243)
Dividends declared on preferred shares	(3,983)			(3,983)
Share-based compensation, net	432	$ 1	440	(9)
Share-based compensation, net (in shares)		74,180
Ending Balance at Jun. 30, 2019	(179,684)	$ 432	202,264	(382,380)	0
Ending Balance (in shares) at Jun. 30, 2019		43,159,931
Ending Balance at Aug. 31, 2019	155,125					$ 150,000	$ 5,125
Ending Balance (in shares) at Aug. 31, 2019						6,000,000	5,125
Shareholders' Equity
Net income (loss)	(2,011)			(2,011)
Dividends declared on preferred shares	(2,653)			(2,653)
Share-based compensation, net	170		170
Ending Balance at Aug. 31, 2019	$ (184,178)	$ 432	$ 202,434	$ (387,044)	$ 0
Ending Balance (in shares) at Aug. 31, 2019		43,159,931