Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended		25 Months Ended
	Jan. 25, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jan. 24, 2020	Dec. 31, 2019	Jun. 30, 2019	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
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			$ 1,500			$ 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 shares		$ 0.001				$ 0.001				$ 0.001
Common stock, shares outstanding		43,781,684		33,774,386		43,781,684	33,774,386	43,779,924		38,647,943	29,745,776	29,796,601
Dividends declared (in usd per share)		$ 0.27		$ 0.42		$ 0.97	$ 1.39
Dividends paid						$ (50,642)	$ (39,226)
Common shares issued and outstanding upon conversion of all convertible securities (in shares)		44,409,822				44,409,822				39,371,584
Number of shares authorized to be repurchased (in shares)													1,550,000
Shares repurchased (in shares)		1,878		0		290,050	50,825	701,965
Average price per share (USD per share)		$ 11.00				$ 10.54	$ 15.39	$ 13.36
Total cost		$ (21)	$ (3,035)		$ (782)	$ (3,100)	$ (800)	$ (9,400)
Stock Issued During Period, Shares, New Issues	5,290,000	0		4,025,000		5,290,000	4,025,000
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		3,638		3,610		133,154	3,610