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Perpetual Convertible Preferred Shares - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Aug. 08, 2018	Jun. 30, 2019	Jun. 30, 2018
Temporary Equity [Line Items]
Transaction-related expenses incurred		$ 1,679	$ 0
Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Stock purchase price (usd per share)	$ 25.00
Restrictive period after closing date on transferring shares or economic interest	5 years
Quarterly distributions entitlement rate as percent of varying rate (percent)	25.00%
Liquidation preference (usd per share)	$ 25.00
Redemption fee (percent)	1.50%
Preferred Stock Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Aggregate number of shares to be purchased under transaction agreement (shares)	10,000,000
First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Aggregate number of shares to be purchased under transaction agreement (shares)	5,000,000
Redemption rights, period from issuance	5 years
Conversion rights, period from issuance	5 years
Secondary Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Aggregate number of shares to be purchased under transaction agreement (shares)	5,000,000
Stock purchase price	$ 125,000
Additional shares to be purchased (shares)	5,000,000
Conversion rights, period from issuance	5 years
Triggering event | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Redemption price per share (usd per share)	$ 25.00
EA-1 | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Aggregate number of shares to be purchased under transaction agreement (shares)	5,000,000
Stock purchase price	$ 125,000
Transaction fees paid (percent)	3.50%
Transaction-related expenses incurred	$ 400
EA-1 | Advisor | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Transaction-related expenses incurred	$ 200
Aug 8, 2018 | From and After First issuance Until Fifth Anniversary | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		6.55%
Anniversary period since issuance date		5 years
Aug 8, 2018 | From and After Second Issuance Date Until Fifth Anniversary | Secondary Issuance | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		6.55%
Anniversary period since issuance date		5 years
Aug 8, 2018 | From and After Reset Date | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)	6.75%
Aug 2, 2020 | After First Triggering Event but Before Reset Date | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		7.55%
Aug 2, 2020 | After First Triggering Event and Also After Reset Date | Reset date | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		7.75%
Aug 2, 2021 | Reset date | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		8.25%
Aug 2, 2021 | Triggering event | Series A Cumulative Perpetual Convertible Preferred Stock
Temporary Equity [Line Items]
Initial annual distribution (percent)		8.05%

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