INVESTMENT IN HOTEL PROPERTIES, NET - Pro forma financial information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) hotel $ / shares	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2018 USD ($) hotel $ / shares	Sep. 30, 2017 USD ($) $ / shares
Business Combinations [Abstract]
Number of hotels owed | hotel	77		77
Revenues	$ 143,609	$ 140,582	$ 424,745	$ 414,604
Income from hotel operations	53,423	53,515	158,869	158,756
Net income	14,142	17,539	43,113	64,416
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 10,280	$ 13,225	$ 26,546	$ 51,317
Basic net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.10	$ 0.13	$ 0.26	$ 0.52
Diluted net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.10	$ 0.13	$ 0.26	$ 0.52
Real estate tax expense, depreciation expense, interest expense, and other corporate expenses	$ 48,000	$ 43,400	$ 145,200	$ 118,500
Premium on redemption of preferred stock			$ 3,300