EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Jun. 01, 2018	Oct. 02, 2017	Sep. 28, 2017	Aug. 17, 2017	Mar. 21, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Shares of preferred stock issued (in shares)					5,750,000		5,750,000
Preferred stock dividend rate					7.125%
Redemption price per share (in dollars per share)	$ 25.00				$ 25.00
Net proceeds from issuance of preferred stock					$ 138,300
Accrued and unpaid dividends (in dollars per share)	0.4453125
Redemption price per share (in dollars per share)	$ 25.4453125
Charge related to original issuance costs						$ 143,750
Vesting of common stock units (in shares)						100,000	300,000
Tax withholding obligations						$ 400	$ 3,100	$ 1,500
Public Stock Offering
Class of Stock [Line Items]
Shares of common stock issued (in shares)		18,400,000	16,000,000
Consideration received		$ 370,900
Common stock share price (in dollars per share)		$ 21.00
Over-Allotment Option
Class of Stock [Line Items]
Shares of common stock issued (in shares)		2,400,000
Care Capital Properties
Class of Stock [Line Items]
Shares of common stock issued in merger (in shares)				94,000,000
Preferred Stock
Class of Stock [Line Items]
Shares redeemed (in shares)	5,750,000					5,750,000
Charge related to original issuance costs						$ 58
Cumulative Distributions in Excess of Net Income
Class of Stock [Line Items]
Charge related to original issuance costs						$ 5,501