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STOCKHOLDERS' EQUITY - Depository Share Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Payment for redemption of shares		$ 93,269		$ 46,396
Carrying Value		94,956	$ 184,878
Preferred Stock
Class of Stock [Line Items]
Payment for redemption of shares		89,922		41,303
Carrying Value		94,956	184,878
Impact of preferred stock redemption		$ 3,347	$ (568)	$ 5,093
Preferred Stock | Series D Depository shares
Class of Stock [Line Items]
Outstanding shares redeemed (shares)		3,730,767	134,410	734,823
Preferred Stock | Series D Preferred Stock
Class of Stock [Line Items]
Outstanding shares redeemed (shares)		93,269	3,360	18,371
Payment for redemption of shares		$ 93,269	$ 2,698	$ 19,392
Carrying Value		0	89,922
Impact of preferred stock redemption	$ 3,300	$ 3,347	$ (541)	$ 1,681
Preferred Stock | Series E Depository shares
Class of Stock [Line Items]
Outstanding shares redeemed (shares)		0	70,967	980,928
Preferred Stock | Series E Preferred Stock
Class of Stock [Line Items]
Outstanding shares redeemed (shares)		0	1,774	24,523
Payment for redemption of shares		$ 0	$ 1,680	$ 27,005
Carrying Value		94,956	94,956
Impact of preferred stock redemption		$ 0	$ (27)	$ 3,412

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