INVESTMENT IN HOTEL PROPERTIES, NET - Pro forma financial information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) hotel $ / shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2017 USD ($) hotel $ / shares	Sep. 30, 2016 USD ($) $ / shares
Business Combinations [Abstract]
Number of hotels owed | hotel	79		79
Revenues	$ 136,369	$ 135,373	$ 405,289	$ 408,104
Income from hotel operations	50,458	52,250	152,282	160,450
Net income before taxes	14,234	25,181	58,044	79,569
Net income	14,465	26,426	57,431	76,108
Net income attributable to common stockholders, net of amount allocated to participating securities (1)	$ 10,162	$ 21,275	$ 44,359	$ 62,357
Basic net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.10	$ 0.25	$ 0.45	$ 0.72
Diluted net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.10	$ 0.24	$ 0.45	$ 0.71
Real estate tax expense, depreciation expense, interest expense, and other corporate expenses	$ 46,200	$ 34,300	$ 124,300	$ 110,900