REDEEMABLE PREFERRED STOCK - Series L Preferred Stock Narrative (Details) - Series L Preferred Stock - USD ($) $ / shares in Units, $ in Millions	Nov. 21, 2017	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	8,080,740	8,080,740	5,387,160
Preferred stock, liquidation preference per share (in usd per share)		$ 28.37	$ 28.37
Gross proceeds from sale of preferred stock	$ 229.3
Offering costs	15.9
Discount on shares issued	2.9
Offering costs, non-issuance specific	$ 2.5
Minimum fixed charge coverage ratio	125.00%
Registration Statement
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in usd per share)	$ 28.37