INVESTMENT IN HOTEL PROPERTIES, NET - Summary of hotel properties acquired (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Room	Sep. 30, 2017 USD ($) Room
Business Acquisition [Line Items]
Number of guestrooms | Room	150	1,790
Purchase Price	$ 71,000	$ 421,950
Net assets acquired	71,002	424,773
Settlement amount of net working capital liabilities	100
Settlement amount of net working capital assets		600
Other assets and capitalized transaction costs	$ 100	$ 2,200
Residence Inn by Marriott | Boston (Watertown), MA
Business Acquisition [Line Items]
Number of guestrooms | Room	150
Purchase Price	$ 71,000
Residence Inn by Marriott | Baltimore, MD
Business Acquisition [Line Items]
Number of guestrooms | Room		188
Purchase Price		$ 38,500
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
Courtyard by Marriott | Fort Worth, TX
Business Acquisition [Line Items]
Number of guestrooms | Room		203
Purchase Price		$ 40,000
Courtyard by Marriott | Kansas City, MO
Business Acquisition [Line Items]
Number of guestrooms | Room		123
Purchase Price		$ 24,500
Courtyard by Marriott | Pittsburgh, PA
Business Acquisition [Line Items]
Number of guestrooms | Room		182
Purchase Price		$ 42,000
Hampton Inn & Suites | Baltimore, MD
Business Acquisition [Line Items]
Number of guestrooms | Room		116
Purchase Price		$ 18,000
AC Hotel by Marriott | Atlanta, GA
Business Acquisition [Line Items]
Number of guestrooms | Room		255
Purchase Price		$ 57,500