INVESTMENT IN HOTEL PROPERTIES, NET - Pro forma financial information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) hotel $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($) hotel $ / shares	Jun. 30, 2017 USD ($) $ / shares
Business Combinations [Abstract]
Number of hotels owed | hotel	80		80
Revenues	$ 148,501	$ 144,912	$ 285,145	$ 278,044
Income from hotel operations	56,877	56,769	106,148	106,232
Net income	19,640	25,656	28,971	47,072
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 15,765	$ 21,249	$ 16,256	$ 38,279
Basic net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.15	$ 0.22	$ 0.16	$ 0.40
Diluted net income per share attributable to common shareholders (in dollars per share) | $ / shares	$ 0.15	$ 0.22	$ 0.16	$ 0.40
Real estate tax expense, depreciation expense, interest expense, and other corporate expenses	$ 49,000	$ 39,100	$ 97,800	$ 76,000
Premium on redemption of preferred stock			$ 3,300