Fair Value Measurements and Derivative Instruments (Schedule of Impairment and Recovery of Previously Recorded Impairment) (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018 USD ($) property	Jun. 30, 2017 USD ($) property	Mar. 31, 2017 USD ($) property	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($) property
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of hotels | property				1	4
Impairment (loss) recovery, Total net impairments		$ (479)		$ 93	$ (750)
Sold [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment (loss) recovery, Total net impairments	$ 93		$ 80
Sold [Member] | Impairment Loss [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of hotels | property		2			2
Impairment (loss) recovery, Sold hotels		$ (479)			$ (830)
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				$ 93	$ 80