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STOCKHOLDERS' EQUITY - Depository Share Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Carrying Value	$ 94,956		$ 184,878
Preferred Stock
Class of Stock [Line Items]
Carrying Value	$ 94,956		184,878
Preferred Stock | Series D Depository Shares
Class of Stock [Line Items]
Shares redeemed (in shares)	3,730,767	81,304
Payment for redemption of shares	$ 93,300
Preferred Stock | Series D Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)	93,269	2,033
Payment for redemption of shares	$ 93,269	$ 1,458
Carrying Value	0		89,922	$ 1,959
Impact of preferred stock redemption	$ 3,347	$ (501)
Preferred Stock | Series E Depository Shares
Class of Stock [Line Items]
Shares redeemed (in shares)	0	7,400
Preferred Stock | Series E Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)	0	185
Payment for redemption of shares		$ 153
Carrying Value	$ 94,956		$ 94,956	$ 178
Impact of preferred stock redemption	$ 0	$ (25)

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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Number of stock bought back by the entity at the exercise price or redemption price.

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