Fair Value Measurements and Derivative Instruments (Schedule of Impairment and Recovery of Previously Recorded Impairment) (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($) property	Mar. 31, 2018 USD ($) property	Sep. 30, 2017 USD ($) property	Sep. 30, 2018 USD ($) property	Sep. 30, 2017 USD ($) property
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of hotels | property			4	1	6
Impairment (loss) recovery, Total net impairments			$ (848)	$ 93	$ (1,598)
Sold [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment (loss) recovery, Total net impairments		$ (93)	$ (47)		$ (80)
Sold [Member] | Impairment Loss [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of hotels | property			2		4
Impairment (loss) recovery, Sold hotels			$ (895)		$ (1,678)
Sold [Member] | Impairment Recovery [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of hotels | property		1	2	1	2
Impairment (loss) recovery, Sold hotels			$ 47	$ 93	$ 80