Quarterly Operating Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 275,263	$ 289,420	$ 301,252	$ 270,405	$ 280,111	$ 297,666	$ 295,047	$ 236,373	$ 1,136,340	$ 1,109,197	$ 970,380
Net income	74,367	40,933	56,410	48,102	34,070	37,064	53,361	11,985	191,414	136,127	106,743
Net income attributable to common shareholders	73,786	40,594	55,991	47,850	33,845	36,760	52,904	11,932	218,221	135,441	112,921
Comprehensive income	$ 89,478	$ 25,428	$ 61,910	$ 38,447	$ 28,849	$ 42,327	$ 45,991	$ 10,571	$ 215,263	$ 127,738	$ 106,980
Basic per share data:
Income from continuing operations, including gain on disposal of hotel properties (in dollars per share)									$ 1.69	$ 1.06	$ 0.89
Net income per share attributable to common shareholders (in dollars per share)	$ 0.58	$ 0.32	$ 0.43	$ 0.36	$ 0.26	$ 0.28	$ 0.42	$ 0.10	1.69	1.06	0.95
Diluted per share data:
Income from continuing operations, including gain on disposal of hotel properties (in dollars per share)									1.68	1.05	0.88
Net income per share attributable to common shareholders (in dollars per share)	$ 0.59	$ 0.31	$ 0.42	$ 0.36	$ 0.25	$ 0.28	$ 0.42	$ 0.10	$ 1.68	$ 1.05	$ 0.94
Basic weighted average common shares outstanding (in shares)	124,256,834	127,663,480	130,670,629	131,272,611	131,189,673	131,106,440	125,260,607	121,740,962	128,444,469	127,360,669	117,950,066
Diluted weighted average common shares outstanding (in shares)	124,679,650	128,143,154	131,618,693	132,286,542	132,186,832	132,386,843	126,475,051	122,867,755	128,967,754	128,293,843	118,738,626