Commitments and Contingencies (Management Agreements) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) hotel	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) hotel	Jun. 30, 2015 USD ($)
Other Commitments
Number of Hotel Properties Operated under Management Agreements | hotel	125		125
Management Agreements which include Franchise Agreement, Base Management Fee as Percentage of Hotel Revenues			7.00%
Management fee expense | $	$ 12.6	$ 12.5	$ 23.7	$ 23.4
Minimum
Other Commitments
Management Agreement Term			3 years
Base Management Fee as Percentage of Hotel Revenues			3.00%
Maximum
Other Commitments
Management Agreement Term			25 years
Base Management Fee as Percentage of Hotel Revenues			3.50%