INVESTMENT IN HOTEL PROPERTIES - Summary of hotel properties acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Room	Dec. 31, 2017 USD ($) Room
Business Acquisition [Line Items]
Number of guestrooms | Room		2,442
Purchase Price		$ 585,950
Net assets acquired	$ 71,002	588,822
Settlement amount of net working capital liabilities	100
Settlement amount of net working capital assets		200
Capitalized transaction costs	$ 100	$ 2,600
Residence Inn by Marriott | Boston (Watertown), MA
Business Acquisition [Line Items]
Number of guestrooms | Room	150
Purchase Price	$ 71,000
Homewood Suites | Aliso Viejo (Laguna Beach), CA
Business Acquisition [Line Items]
Number of guestrooms | Room		129
Purchase Price		$ 38,000
Hyatt Place | Phoenix (Mesa), AZ
Business Acquisition [Line Items]
Number of guestrooms | Room		152
Purchase Price		$ 22,200
Courtyard by Marriott | Fort Lauderdale, FL
Business Acquisition [Line Items]
Number of guestrooms | Room		261
Purchase Price		$ 85,000
Courtyard by Marriott | Charlotte, NC
Business Acquisition [Line Items]
Number of guestrooms | Room		181
Purchase Price		$ 56,250
Portfolio Purchase - five properties
Business Acquisition [Line Items]
Number of guestrooms | Room		812
Purchase Price		$ 163,000
AC Hotel by Marriott | Atlanta, GA
Business Acquisition [Line Items]
Number of guestrooms | Room		255
Purchase Price		$ 57,500
Portfolio Purchase - four properties
Business Acquisition [Line Items]
Number of guestrooms | Room		652
Purchase Price		$ 164,000