Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 15, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	50,000,000			50,000,000			50,000,000
Preferred Stock, Shares Outstanding (in shares)	4,460,000			4,460,000			7,248,330
Preferred stock redemption charge	$ 0		$ 0	$ 2,987	$ 3,914
Stock issuance costs				329	0
Share-based compensation expense	$ 760		$ 568	$ 1,755	$ 1,299
ATM Offering
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	1,590,740
Consideration received on transaction	$ 27,898
Stock issuance costs	$ 353
Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	6,600,000			6,600,000
Preferred Stock, Shares Outstanding (in shares)	4,460,000			4,460,000
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 25.00			$ 25.00
Preferred Stock, Dividend Rate, Percentage				6.90%
Preferred Stock, Dividends Per Share, Declared	$ 0.43125
Series C Preferred Stock | London Interbank Offered Rate (LIBOR)
Class of Stock [Line Items]
Preferred Stock, Dividend Payment Rate, Basis Spread on Variable Rate				5.461%
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		7.625%
Stock Redeemed or Called During Period, Shares		2,788,330
Preferred Stock, Redemption Price Per Share						$ 25.15
Preferred stock redemption charge				$ 2,987