Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands																																							1 Months Ended												3 Months Ended	12 Months Ended
	Feb. 02, 2021	Jan. 04, 2021	Dec. 21, 2020	Dec. 10, 2020	Dec. 01, 2020	Nov. 20, 2020	Nov. 10, 2020	Nov. 02, 2020	Oct. 23, 2020	Oct. 13, 2020	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. 14, 2020	Mar. 10, 2020	Mar. 02, 2020	Feb. 24, 2020	Feb. 14, 2020	Feb. 03, 2020	Jan. 24, 2020	Jan. 13, 2020	Dec. 31, 2020	Nov. 30, 2020	Oct. 31, 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	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 15, 2021	Mar. 16, 2020
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																																																				$ 117,818	$ 83,812	$ 43,457
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs																																																				$ 25	$ 258	$ 95
Preferred Stock, Shares Outstanding																																							7,248,330												7,248,330	7,248,330	6,788,330
Redemption Premium																																																			$ 3,914
Preferred Stock, Shares Issued																																							7,248,330												7,248,330	7,248,330	6,788,330
Dividends Payable, Date Declared, Month and Year				Dec. 10, 2020			Nov. 10, 2020			Oct. 13, 2020			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	$ 0.13	$ 0.13	$ 0.13	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15
Subsequent Event [Member]
Class of Stock [Line Items]
Stock issuance, shares	3,162,500
Stock issuance, value	$ 55,510
Preferred Stock, Redemption Price Per Share																																																							$ 25.15
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																																																				762.50%
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 paid 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																																																			$ 107,843
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs																																																			$ 3,657
Preferred Stock, Dividend Rate, Percentage																																																				690.00%
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			Dec. 21, 2020			Nov. 20, 2020			Oct. 23, 2020			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					Dec. 01, 2020			Nov. 02, 2020			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
Common Stock | Subsequent Event [Member]
Class of Stock [Line Items]
Dividends Payable, Date to be Paid		Jan. 04, 2021