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STOCKHOLDERS' EQUITY - Depository Share Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Carrying Value	$ 94,956			$ 94,956		$ 184,878
Preferred Stock
Class of Stock [Line Items]
Carrying Value	$ 94,956			$ 94,956		184,878
Preferred Stock | Series D Depository Shares
Class of Stock [Line Items]
Shares redeemed (in shares)	0		53,006	3,730,767	134,310
Payment for redemption of shares	$ 0
Preferred Stock | Series D Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)	0		1,325	93,269	3,357
Payment for redemption of shares			$ 1,238	$ 93,269	$ 2,696
Carrying Value	$ 0			0		89,922	$ 1,278	$ 3,237
Impact of preferred stock redemption	$ 0	$ 3,300	$ (40)	$ 3,347	$ (541)
Preferred Stock | Series E Depository Shares
Class of Stock [Line Items]
Shares redeemed (in shares)	0		57,065	0	64,465
Payment for redemption of shares				$ 0
Preferred Stock | Series E Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)	0		1,427	0	1,612
Payment for redemption of shares	$ 0		$ 1,363		$ 1,516
Carrying Value	94,956			$ 94,956		$ 94,956	$ 1,372	$ 1,550
Impact of preferred stock redemption	$ 0		$ (9)	$ 0	$ (34)

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