Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended		34 Months Ended
	Jan. 25, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jan. 24, 2020	Dec. 31, 2019	Jun. 13, 2018
Subsidiary, Sale of Stock [Line Items]
Preferred Stock, Shares Issued		4,600,000				4,600,000				4,600,000
Preferred Stock, Dividend Rate, Percentage			6.75%			6.75%
Preferred Stock, Shares Outstanding		4,600,000				4,600,000				4,600,000
Preferred Stock, Shares Authorized		100,000,000				100,000,000				100,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.001				$ 0.001				$ 0.001
Preferred Stock, Liquidation Preference Per Share		$ 25.00				$ 25.00
Preferred Stock, Amount of Preferred Dividends in Arrears			$ 1,300			$ 1,300
Preferred Stock Dividend Rate Variable Rate Spread						5.196%
Common stock, shares authorized (in shares)		100,000,000				100,000,000				100,000,000
Common Stock, Par or Stated Value Per Share		$ 0.001				$ 0.001				$ 0.001
Common stock, shares outstanding		43,781,684	43,781,684	43,779,924	43,779,924	43,781,684	43,779,924	43,781,684		43,781,684		38,647,943
Dividends declared (in usd per share)		$ 0.44		$ 0.25		$ 0.74	$ 0.70
Dividends paid						$ (34,553)	$ (36,721)
Common shares issued and outstanding upon conversion of all convertible securities (in shares)		44,459,862				44,459,862			44,442,631
Number of shares authorized to be repurchased (in shares)													1,550,000
Shares repurchased (in shares)		0		0		0	288,172	701,965
Average price per share (USD per share)							$ 10.53	$ 13.36
Total cost					$ (3,035)		$ (3,000)	$ (9,400)
Stock Issued During Period, Shares, New Issues	5,290,000	0		0		0	5,290,000
Proceeds from issuance of shares, net											$ 95,300
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	690,000
Operating Partnership Units [Member]
Subsidiary, Sale of Stock [Line Items]
Stock issued during period, shares, conversion of units		0		0		0	129,516