Acquisition of Hotel Properties - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Revenue									$ 1,893,899	$ 1,996,517	$ 1,149,453
Net income attributable to common shareholders									$ 110,231	$ 213,354	$ 222,498
Net income per share attributable to common shareholders - basic (in dollars per share)									$ 0.63	$ 1.23	$ 1.72
Net income per share attributable to common shareholders - diluted (in dollars per share)									$ 0.63	$ 1.22	$ 1.71
Weighted-average number of common shares (in shares)	174,147,522	140,249,961	123,785,735	123,734,173	123,698,633	123,621,323	123,544,034	123,739,823	140,616,838	123,651,003	128,444,469
Weighted average number of shares outstanding - diluted (in shares)											128,967,754