SHAREHOLDERS’ EQUITY (Details Narrative) - USD ($)																	3 Months Ended												4 Months Ended	8 Months Ended	12 Months Ended
	Aug. 16, 2021	Feb. 11, 2021	Jan. 15, 2021	Jan. 13, 2021	Oct. 20, 2020	Oct. 20, 2020	Jul. 22, 2020	Jun. 30, 2020	Oct. 21, 2019	Apr. 29, 2019	Apr. 26, 2019	Apr. 26, 2019	Jan. 22, 2018	Aug. 31, 2017	Aug. 02, 2017	Jul. 26, 2017	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 15, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Authorized capital stock																	170,400,000												170,400,000		170,400,000
Common stock, par value																	$ 0.10				$ 0.10								$ 0.10		$ 0.10	$ 0.10
Excess of capital stock																	3,000,000.0												3,000,000.0		3,000,000.0
Payments for Repurchase of Common Stock																															$ 0	$ 1,830,000	$ 237,000
Common Stock, Dividends, Per Share, Cash Paid																	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18			$ 0.76	$ 0.72	$ 0.72
Preferred Stock, Par or Stated Value Per Share																																		$ 0.10
Common stock, shares authorized					3,700,000	3,700,000											144,164,000				144,164,000								144,164,000		144,164,000	144,164,000		140,400,000
Proceeds from Issuance of Preferred Stock and Preference Stock																															$ (0)	$ (0)	$ 96,688,000
Excess Stock, Shares Authorized																	3,000,000				3,000,000								3,000,000		3,000,000	3,000,000
New Common ATM Program [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares reserved for future issuance																	$ 4,000,000												$ 4,000,000		$ 4,000,000
New Common ATM Program [Member] | Twenty Twenty Registration Statement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity																													$ 94,400,000
Sale of Stock, Number of Shares Issued in Transaction																													4,000,000
Sale of Stock, Price Per Share																	$ 24.15												$ 24.15		$ 24.15
Gross proceeds from sale of equity after offering expenses																													$ 96,000,000
New Preferred Stock-At-The Market Sales Program [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity							$ 100,000,000
Preferred Stock ATM Sales Program [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale of Stock, Number of Shares Issued in Transaction																															2,200,000
Sale of Stock, Price Per Share																	$ 24.89												$ 24.89		$ 24.89
Sale of Stock, Consideration Received on Transaction																															$ 54,100,000
Sale of Stock, Consideration Received Per Transaction																															$ 53,200,000
Shares reserved for future issuance																	12,200,000												12,200,000		12,200,000
Articles of Amendment and Articles Supplementary [Member] | Maryland State Department Of Assessments And Taxation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Excess Stock, Shares Authorized																																		3,000,000
Dividend Reinvestment Stock Purchase Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Percentage of discount on purchase price under dividend reinvestment plan																															95.00%
Dividend Reinvestment Stock Purchase Plan [Member] | Minimum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of optional cash payments																															$ 500
Maximum monthly amount granted for waivers for purchase of shares			$ 1,000
Reduction in maximum monthly amount granted for waivers for purchase of shares		$ 1,000
Dividend Reinvestment Stock Purchase Plan [Member] | Maximum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of optional cash payments																															$ 1,000
Maximum monthly amount granted for waivers for purchase of shares			$ 5,000
Reduction in maximum monthly amount granted for waivers for purchase of shares		$ 5,000
Series C Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Authorized capital stock																	13,800,000												13,800,000		13,800,000
Sale of Stock, Number of Shares Issued in Transaction										4,000,000
Preferred Stock, Redemption Price Per Share																$ 25.00
Preferred Stock, Par or Stated Value Per Share																$ 0.10	$ 0.10				$ 0.10								$ 0.10		$ 0.10	$ 0.10
Stock Issued During Period, Shares, Period Increase (Decrease)											16,000,000
Preferred Stock, Shares Issued																	9,884,000				9,884,000								9,884,000		9,884,000	9,884,000
Preferred Stock, Shares Outstanding																	9,884,000				9,884,000								9,884,000		9,884,000	9,884,000
Sale of Stock, Consideration Received on Transaction										$ 96,700,000
Preferred Stock, Shares Authorized																	13,750,000				13,750,000								13,750,000		13,750,000	13,750,000
Series C Preferred Stock [Member] | Maryland State Department Of Assessments And Taxation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock Issued During Period, Shares, Period Increase (Decrease)																30,800,000
Series C Preferred Stock [Member] | Amendment [Member] | Maryland State Department Of Assessments And Taxation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification of common shares to preferred stock												4,000,000
Series D Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Authorized capital stock																	9,300,000												9,300,000		9,300,000
Preferred Stock, Par or Stated Value Per Share													$ 0.10				$ 0.10				$ 0.10								$ 0.10		$ 0.10	$ 0.10
Preferred Stock, Shares Issued																	8,609,000				6,434,000								8,609,000		8,609,000	6,434,000
Preferred Stock, Shares Outstanding																	8,609,000				6,434,000								8,609,000		8,609,000	6,434,000
Preferred Stock, Shares Authorized																	9,300,000				9,300,000								9,300,000		9,300,000	9,300,000
Series D Preferred Stock [Member] | 2019 Preferred ATM Program [Member] | B. Riley FBR, Inc [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale of Stock, Number of Shares Issued in Transaction																														3,200,000		2,600,000
Sale of Stock, Price Per Share								$ 25.09													$ 25.06		$ 25.09							$ 25.09		$ 25.06
Gross proceeds from issuance of stock																														$ 80,500,000		$ 64,100,000
Proceeds from Issuance of Preferred Stock and Preference Stock																														$ 79,100,000		$ 63,100,000
8.0% Series B Cumulative Redeemable Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock redemption, shares					3,800,000
Preferred Stock, Liquidation Preference Per Share					$ 25.00	$ 25.00
Common Stock, Dividends, Per Share, Cash Paid					0.2722
Preferred Stock, Redemption Price Per Share					$ 25.2722	$ 25.2722
Preferred stock redemption payment					$ 96,100,000
Preferred stock redemption additional cost					$ 2,900,000	$ 2,900,000
Preferred stock converted to authorized unissued shares					3,800,000
6.75% Series C Cumulative Redeemable Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity															$ 18,200,000	$ 120,800,000
Sale of Stock, Number of Shares Issued in Transaction										4,000,000					750,000	5,000,000
Preferred Stock, Dividend Rate, Percentage										6.375%
Preferred Stock, Liquidation Preference Per Share																$ 25.00
Common Stock, Dividends, Per Share, Cash Paid																															$ 1.6875
Preferred Stock, Redemption Price Per Share																$ 25.00
Shares Issued, Price Per Share										$ 25.00
Preferred Stock, Shares Issued										5,800,000
Preferred Stock, Shares Outstanding																									9,800,000								9,800,000
6.75% Series C Cumulative Redeemable Preferred Stock [Member] | Over-Allotment Option [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sale of Stock, Number of Shares Issued in Transaction										400,000
Series C Preferred Shares [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification of common shares to preferred stock																5,800,000
Series A Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock redemption, shares														3,700,000
6.375% Series D Cumulative Redeemable Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity													$ 48,200,000
Sale of Stock, Number of Shares Issued in Transaction													2,000,000
Preferred Stock, Liquidation Preference Per Share													$ 25.00
Preferred Stock, Redemption Price Per Share													$ 25.00
Description of preferred stock dividend													arrears on March 15, June 15, September 15, and December 15 at an annual rate of $1.59375 per share
Series D Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred Stock, Redemption Price Per Share													$ 25.00
Series C and Series D Preferred Stock [Member] | 2019 Preferred ATM Program [Member] | B. Riley FBR, Inc [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity									$ 100,000,000
Series B Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Redemption of preferred stock converted into common stock					3,700,000	3,700,000
Common Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Authorized capital stock																	144,200,000												144,200,000		144,200,000
Common stock, par value																	$ 0.10												$ 0.10		$ 0.10
Common Stock [Member] | ATM Program [Member] | B. Riley FBR, Inc [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from sale of equity	$ 100,000,000							$ 100,000,000
Sale of Stock, Number of Shares Issued in Transaction																															4,200,000
Sale of Stock, Price Per Share																	$ 20.26												$ 20.26		$ 20.26
Gross proceeds from issuance of stock																															$ 86,000,000
Proceeds from issuance after offering expenses																															$ 84,700,000
Common Stock [Member] | Series D Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification of common shares to preferred stock													2,300,000
8.0% Series B Cumulative Redeemable Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Authorized capital stock																	199,000												199,000		199,000
Preferred Stock, Dividend Rate, Percentage						8.00%
Issuer Purchases of Equity Securities [Member] | Maximum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payments for Repurchase of Common Stock				$ 25,000,000
Series D Preferred Share [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Common stock, shares authorized																																		3,300,000
Preferred Stock, Shares Authorized																																		9,300,000
Series B Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred Stock, Shares Authorized																																		4,000,000.0
Series C Preferred Share [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred Stock, Shares Authorized																																		13,800,000