EQUITY - Narrative (Details) - USD ($)					12 Months Ended
	Dec. 11, 2019	Feb. 25, 2019	Jun. 01, 2018	Mar. 21, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred stock dividend rate				7.125%
Redemption price per share (in dollars per share)			$ 25.00
Accrued and unpaid dividends (in dollars per share)			0.4453125
Redemption price per share (in dollars per share)			$ 25.4453125
Vesting of common stock units (in shares)					100,000	100,000
Tax withholding obligations					$ 1,500,000	$ 400,000	$ 3,100,000
Prior ATM Program
Class of Stock [Line Items]
Sale of stock, maximum proceeds from common stock issuances		$ 500,000,000.0
Shares of common stock issued (in shares)					23,900,000
Sale of stock, average price per share (in dollars per share)					$ 20.92
Proceeds from issuance of common stock					$ 500,000,000.0
Payments of stock issuance costs					$ 7,500,000
New ATM Program
Class of Stock [Line Items]
Sale of stock, maximum proceeds from common stock issuances	$ 400,000,000.0
Shares of common stock issued (in shares)					2,900,000
Sale of stock, average price per share (in dollars per share)					$ 20.86
Proceeds from issuance of common stock					$ 60,000,000.0
Payments of stock issuance costs					200,000
Sale of stock, remaining amount available for issuance					$ 340,000,000.0
Preferred Stock Dividends
Class of Stock [Line Items]
Charge related to original issuance costs						$ 5,500,000
Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)			5,750,000			5,750,000