SHAREHOLDERS’ EQUITY (Details Narrative) - USD ($)					1 Months Ended				3 Months Ended		9 Months Ended
	Oct. 02, 2021	Jan. 13, 2021	Jul. 22, 2020	Jun. 30, 2020	Oct. 31, 2021	Sep. 30, 2021	Sep. 15, 2021	Aug. 16, 2021	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Capital stock, shares authorized						170,400,000					170,400,000
Common stock, shares authorized						144,164,000					144,164,000		144,164,000
Common stock, par value						$ 0.10					$ 0.10		$ 0.10
Excess stock, shares authorized						3,000,000					3,000,000		3,000,000
Dividends paid							$ 9,000,000.0
Dividend paid price per share							$ 0.19
Dividend payable date of record							Aug. 16, 2021
Proceed from dividend reinvestment and stock purchase plan (DRIP)											$ 2,600,000	$ 2,300,000
Stock repurchased, value									$ 225,000	$ 1,604,000
Common Stock [Member]
Class of Stock [Line Items]
Proceed from dividend reinvestment and stock purchase plan (DRIP)											7,400,000
Stock repurchased, value									$ 2,000	$ 15,000
Common Stock [Member] | A T M Program [Member] | B. Riley FBR, Inc [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues				$ 100,000,000
Common Stock [Member] | New Common ATM Program [Member] | New Distribution Agents [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues								$ 100,000,000
Series C Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Dividends paid							$ 4,200,000
Dividend paid price per share							$ 0.421875
Proceed from dividend reinvestment and stock purchase plan (DRIP)											$ 12,500,000
Dividend rate declared								6.75%
Liquidation preference, per share								$ 25.00
Annual rate of dividend											$ 1.6875
Series D Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Dividends paid							$ 3,400,000
Proceed from dividend reinvestment and stock purchase plan (DRIP)											$ 9,700,000
Dividend rate declared								6.375%
Liquidation preference, per share								$ 25.00
Dividend declared per share							$ 0.3984375
Preferred stock dividend payable per share						$ 1.59375					$ 1.59375
Subsequent Event [Member]
Class of Stock [Line Items]
Dividend paid price per share	$ 0.19
Subsequent Event [Member] | Common Stock [Member]
Class of Stock [Line Items]
Dividend payable date of record	Dec. 15, 2021
Date of record	Nov. 15, 2021
Subsequent Event [Member] | Series C Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Dividend payable date of record	Dec. 15, 2021
Date of record	Nov. 15, 2021
Dividend declared per share	$ 0.421875
Subsequent Event [Member] | Series D Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Dividend payable date of record	Dec. 15, 2021
Date of record	Nov. 15, 2021
Stock Purchase Plan [Member]
Class of Stock [Line Items]
Reinvestment of dividend							$ 861,000				$ 2,600,000
DRIP [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues											400,000
Common Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchased, value		$ 25,000,000
Common ATM Program [Member]
Class of Stock [Line Items]
Sale of Stock, Consideration Received on Transaction											$ 86,000,000.0
Sale of Stock, Consideration Received Per Transaction											$ 84,700,000
Common ATM Program [Member] | Twenty Twenty Registration Statement [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction											4,200,000
Sale of Stock, Price Per Share						20.26					$ 20.26
New Common ATM Program [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction											5,400,000
Sale of Stock, Price Per Share						$ 20.97					$ 20.97
Sale of Stock, Consideration Received on Transaction											$ 112,300,000
Sale of Stock, Consideration Received Per Transaction											110,500,000
[custom:CommonSharesReservedForFutureIssuanceValue-0]						$ 73,800,000					$ 73,800,000
New Common ATM Program [Member] | Twenty Twenty Registration Statement [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction						1,100,000
Sale of Stock, Price Per Share						$ 23.70					$ 23.70
Sale of Stock, Consideration Received on Transaction						$ 26,200,000
Sale of Stock, Consideration Received Per Transaction						$ 25,800,000
New Common ATM Program [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction					334,000
Sale of Stock, Price Per Share					$ 23.16
Sale of Stock, Consideration Received on Transaction					$ 7,700,000
Sale of Stock, Consideration Received Per Transaction					$ 7,600,000
[custom:PreferredCapitalSharesReservedForFutureIssuance-0]					58.3
Preferred Stock At-The-Market Sales Program [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues			$ 100,000,000
Preferred Stock ATM Sales Program [Member]
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction											2,200,000
Sale of Stock, Price Per Share						$ 24.89					$ 24.89
Sale of Stock, Consideration Received on Transaction											$ 54,100,000
Sale of Stock, Consideration Received Per Transaction											$ 53,200,000
[custom:PreferredCapitalSharesReservedForFutureIssuance-0]						12,200,000					12,200,000
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative redeemable preferred stock, shares authorized						199,000					199,000
Cumulative redeemable preferred stock, percentage						8.00%					8.00%
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative redeemable preferred stock, shares authorized						13,750,000					13,750,000		13,750,000
Cumulative redeemable preferred stock, percentage						6.75%					6.75%		6.75%
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative redeemable preferred stock, shares authorized						9,300,000					9,300,000		9,300,000
Cumulative redeemable preferred stock, percentage						6.375%					6.375%		6.375%