Quarterly Operating Results (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 280,111	$ 297,666	$ 295,047	$ 236,373	$ 242,571	$ 252,116	$ 260,823	$ 214,870	$ 1,109,197	$ 970,380	$ 849,685
Income from continuing operations, including gain on disposal of hotel properties	34,070	37,064	53,361	11,985	25,595	33,774	38,571	8,803	136,127	106,743	43,462
Income (loss) from discontinued operations					2,087	3,158	2,410	(219)	0	7,436	(2,143)
Net income	33,845	36,760	52,904	11,932	27,445	36,475	40,510	8,491	135,441	112,921	41,298
Comprehensive income	$ 28,849	$ 42,327	$ 45,991	$ 10,571	$ 32,937	$ 20,513	$ 45,514	$ 8,016	$ 127,738	$ 106,980	$ 43,080
Net income (loss) per share attributable to common shareholders before discontinued operations (in dollars per share)	$ 0.26	$ 0.28	$ 0.42	$ 0.10	$ 0.21	$ 0.28	$ 0.32	$ 0.08	$ 1.06	$ 0.89	$ 0.40
Discontinued operations (in dollars per share)					$ 0.01	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ 0.06	$ (0.02)
Net income per share attributable to common shareholders (in dollars per share)	$ 0.26	$ 0.28	$ 0.42	$ 0.10	$ 0.22	$ 0.31	$ 0.34	$ 0.08	$ 1.06	$ 0.95	$ 0.38
Income from continuing operations (in dollars per share)	$ 0.25	$ 0.28	$ 0.42	$ 0.10	$ 0.21	$ 0.27	$ 0.32	$ 0.08	$ 1.05	$ 0.88	$ 0.40
Discontinued operations (in dollars per share)					$ 0.01	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ 0.06	$ (0.02)
Net income per share attributable to common shareholders (in dollars per share)	$ 0.25	$ 0.28	$ 0.42	$ 0.10	$ 0.22	$ 0.30	$ 0.34	$ 0.08	$ 1.05	$ 0.94	$ 0.38
Basic weighted average common shares outstanding	131,189,673	131,106,440	125,260,607	121,740,962	121,667,166	121,594,219	121,520,253	106,815,375	127,360,669	117,950,066	105,423,604
Diluted weighted average common shares outstanding	132,186,832	132,386,843	126,475,051	122,867,755	122,540,253	122,750,121	122,280,431	107,423,195	128,293,843	118,738,626	105,748,686