Marketing and Reservation Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Advances, Marketing and Reservation Activities [Line Items]
Depreciation and amortization	$ 3,095	$ 2,986	$ 9,215	$ 8,707
Interest expense	11,399	11,150	33,884	33,466
Marketing And Reservation Fees
Advances, Marketing and Reservation Activities [Line Items]
Marketing and reservation system costs exceed marketing and reservation system revenues, amount	3,900		3,900		$ 18,100
Depreciation and amortization	$ 6,500	6,300	18,700	18,700
Interest expense		$ 1	$ 1	$ 6