Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 214,520	$ 201,148
Less: Accumulated depreciation and amortization	(130,459)	(112,990)
Property and equipment, at cost, net	84,061	88,158
Depreciation and amortization	11,705	11,542	$ 9,365
Depreciation expense, excluding marketing and reservation	5,600	4,300	3,100
Land and land improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,107	3,107
Facilities in progress and software under development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,825	21,089
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	132,610	117,762
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37,232	37,205
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,919	17,158
Assets under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,827	4,827
Less: Accumulated depreciation and amortization	(3,800)	(2,900)
Property and equipment
Property, Plant and Equipment [Line Items]
Interest costs capitalized	300	300
Software Development
Property, Plant and Equipment [Line Items]
Property and equipment, at cost, net	37,800	34,700
Depreciation and amortization	$ 11,800	$ 9,600	$ 6,300