Shareholders' Equity (Details) - USD ($)																														1 Months Ended									3 Months Ended						9 Months Ended
	Oct. 01, 2020	Sep. 24, 2020	Sep. 14, 2020	Sep. 01, 2020	Aug. 21, 2020	Aug. 10, 2020	Aug. 04, 2020	Jul. 23, 2020	Jul. 13, 2020	Jul. 01, 2020	Jun. 22, 2020	Jun. 10, 2020	Jun. 01, 2020	May 22, 2020	May 12, 2020	May 01, 2020	Apr. 22, 2020	Apr. 08, 2020	Apr. 01, 2020	Mar. 23, 2020	Mar. 16, 2020	Mar. 14, 2020	Mar. 10, 2020	Mar. 02, 2020	Feb. 24, 2020	Feb. 14, 2020	Feb. 03, 2020	Jan. 24, 2020	Jan. 13, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Preferred Stock, Shares Authorized																														50,000,000									50,000,000						50,000,000	50,000,000
Preferred Stock, Par or Stated Value Per Share																														$ 0.01									$ 0.01						$ 0.01	$ 0.01
Stock issuance, value																																							$ 85,000		$ 107,988,000	$ 6,873,000	$ 18,052,000	$ 58,887,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs																																							$ 5,000	$ 8,000	$ 9,000	$ 9,000	$ 28,000	$ 212,000
Preferred Stock, Shares Outstanding																														7,248,330									7,248,330						7,248,330	6,788,330
Redemption Premium																																							$ 3,914,000
Preferred Stock, Shares Issued																														7,248,330									7,248,330						7,248,330	6,788,330
Dividends Payable, Date Declared, Month and Year			Sep. 14, 2020			Aug. 10, 2020			Jul. 13, 2020			Jun. 10, 2020			May 12, 2020			Apr. 08, 2020					Mar. 10, 2020			Feb. 14, 2020			Jan. 13, 2020
Common Stock, Dividends, Per Share, Declared																														$ 0.13	$ 0.13	$ 0.13	$ 0.13	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage																						8.50%
Preferred Stock, Shares Outstanding																						2,300,000
Preferred Stock, Redemption Price Per Share																						$ 25.35
Preferred Stock, Liquidation Preference Per Share																						$ 25.00
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage																					7.625%
Preferred Stock, Shares Outstanding																					1,700,000
Preferred Stock, Redemption Price Per Share																					$ 25.32
Preferred Stock, Shares Issued																														2,788,330									2,788,330						2,788,330
Preferred Stock, Liquidation Preference Per Share																					$ 25.00									$ 25.00									$ 25.00						$ 25.00
Preferred Stock, Dividend Payment Terms																																													The Series B Preferred Stock pays a cumulative cash dividend equivalent to 7.625% of the $25.00 liquidation preference per share each year.
Preferred Stock, Dividends Per Share, Declared																																							$ 0.4765625
Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized																														6,600,000									6,600,000						6,600,000
Stock issuance, shares																																							4,460,000
Stock issuance, value																																							$ 107,988,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs																																							$ 3,512,000
Preferred Stock, Dividend Rate, Percentage																																													6.90%
Preferred Stock, Liquidation Preference Per Share																														$ 25.00									$ 25.00						$ 25.00
Preferred Stock, Dividend Payment Terms																																													The Series C Preferred stock pays a cumulative cash dividend equivalent to 6.900% of the $25.00 liquidation preference per share each year until April 15, 2025 upon which date and thereafter, the Company will pay cumulative cash dividends at a percentage of the $25.00 liquidation value per share equal to an annual floating rate of three-month LIBOR plus a spread of 5.461%.
Preferred Stock, Dividends Per Share, Declared																																							$ 0.43125
Common Stock
Class of Stock [Line Items]
Dividends Payable, Date of Record		Sep. 24, 2020			Aug. 21, 2020			Jul. 23, 2020			Jun. 22, 2020			May 22, 2020			Apr. 22, 2020			Mar. 23, 2020					Feb. 24, 2020			Jan. 24, 2020
Dividends Payable, Date to be Paid	Oct. 01, 2020			Sep. 01, 2020			Aug. 04, 2020			Jul. 01, 2020			Jun. 01, 2020			May 01, 2020			Apr. 01, 2020					Mar. 02, 2020			Feb. 03, 2020