INVESTMENT IN HOTEL PROPERTIES - Summary of hotel properties acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) hotel Room Property	Dec. 31, 2018 USD ($) Room	Oct. 08, 2019 hotel
Business Acquisition [Line Items]
Number of guestrooms | Room	798	150
Purchase Price	$ 274,500	$ 71,000
Number of hotels | hotel	72
Net assets acquired, excluding purchases adjustments and transaction costs	$ 274,500	71,000
Purchase of adjacent land parcels	2,400
Purchase of net working capital assets	1,000
Capitalized transaction costs	$ 400	100
Purchase at settlement of net working capital liabilities		$ 100
Hampton Inn & Suites | Silverthorne, CO
Business Acquisition [Line Items]
Number of guestrooms | Room	88
Purchase Price	$ 25,500
Portfolio Purchase - four properties
Business Acquisition [Line Items]
Number of guestrooms | Room	710
Purchase Price	$ 249,000
Number of hotels | hotel			4
Residence Inn by Marriott | Boston (Watertown), MA
Business Acquisition [Line Items]
Number of guestrooms | Room		150
Purchase Price		$ 71,000
Hotels
Business Acquisition [Line Items]
Number of guestrooms | Room	11,288
Number of hotels | Property	72
Five hotels acquired in 2019 through joint venture | Hotels
Business Acquisition [Line Items]
Number of hotels | hotel	5
Ownership interest (as a percent)	51.00%