Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended		12 Months Ended	25 Months Ended
	Jan. 25, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Jan. 24, 2020	Dec. 31, 2018	Jun. 13, 2018
Subsidiary, Sale of Stock [Line Items]
Preferred Stock, Shares Issued		4,600,000				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	4,600,000
Preferred Stock, Shares Authorized		100,000,000				100,000,000		100,000,000	100,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.001				$ 0.001		$ 0.001	$ 0.001
Preferred Stock, Liquidation Preference Per Share		$ 25.00				$ 25.00			$ 25.00
Preferred Stock, Amount of Preferred Dividends in Arrears						$ 1,300		$ 1,500
Preferred Stock Dividend Rate Variable Rate Spread						5.196%
Common stock, shares authorized (in shares)		100,000,000				100,000,000		100,000,000	100,000,000
Common shares		$ 0.001				$ 0.001		$ 0.001	$ 0.001
Common stock, shares outstanding		43,779,924	43,779,924	29,745,776	29,745,776	43,779,924	29,745,776	38,647,943	43,779,924		29,796,601
Dividends declared (in usd per share)		$ 0.25		$ 0.42		$ 0.70	$ 0.97
Dividends paid						$ (36,721)	$ (25,298)
Common shares issued and outstanding upon conversion of all convertible securities (in shares)		44,388,860				44,388,860		39,371,584	44,388,860
Number of shares authorized to be repurchased (in shares)												1,550,000
Shares repurchased (in shares)		0		0		288,172	50,825		700,087
Average price per share (USD per share)						$ 10.53	$ 15.39		$ 13.36
Total cost			$ (3,035)		$ (782)	$ (3,000)	$ (800)		$ (9,400)
Stock Issued During Period, Shares, New Issues	5,290,000	0		0		5,290,000	0
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		129,516	0