Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 296,264	$ 236,729
Less: Accumulated depreciation and amortization	(168,729)	(153,355)
Property and equipment, at cost, net	127,535	83,374
Depreciation and amortization	14,330	6,680	$ 6,996
Depreciation expense, excluding marketing and reservation	5,500	5,200	5,600
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,197	3,107
Construction in progress and software under development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,920	13,243
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	180,364	159,786
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,019	37,764
Furniture, fixtures, vehicles and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,937	18,002
Assets under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,827	4,827
Less: Accumulated depreciation and amortization	(4,800)	(4,500)
Property and equipment
Property, Plant and Equipment [Line Items]
Interest costs capitalized	(200)	(400)
Software development
Property, Plant and Equipment [Line Items]
Property and equipment, at cost, net	38,900	40,700
Depreciation and amortization	$ 11,200	$ 11,700	$ 11,800