Impairment Losses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013 property	Dec. 31, 2012
Long Lived Assets Held-for-sale [Line Items]
Assumed holding period for core assets		10 years
Number of held for use hotels with impairment charges			2
Impairment losses on hotels held for use			$ 2.2
Number of hotels reclassified as held for use	1	1
Recovery of previously recorded impairment loss on hotels held for sale or use	$ 0.1			$ 0.3
Minimum [Member]
Long Lived Assets Held-for-sale [Line Items]
Assumption used to determine impairment loss for non-core assets, holding period		3 years
Maximum [Member]
Long Lived Assets Held-for-sale [Line Items]
Assumption used to determine impairment loss for non-core assets, holding period		5 years
Two Held For Use Hotels [Member]
Long Lived Assets Held-for-sale [Line Items]
Number Of Held For Use Hotels With Trigger Event But No Impairment		1