STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares
Class of Stock [Line Items]
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Series D Depository Shares
Class of Stock [Line Items]
Interest in shares (percent)	2.50%
Shares redeemed (in shares)	53,006	134,310
Payment for redemption of shares | $	$ 1,200	$ 2,700
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Shares redeemed (in shares)	1,325	3,357
Deferred issuance costs reclassified to retained earnings | $	$ 40	$ 541
Series E Depository Shares
Class of Stock [Line Items]
Interest in shares (percent)	2.50%
Shares redeemed (in shares)	57,065	64,465
Payment for redemption of shares | $	$ 1,400	$ 1,500
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Shares redeemed (in shares)	1,427	1,612
Deferred issuance costs reclassified to retained earnings | $	$ 9	$ 34