Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax liabilities:
Property and equipment	$ 0	$ (8,557)
Prepaid expenses	(1,501)	(2,349)
Deferred Tax Liabilities, Intangible Assets	(3,597)	0
Deferred Tax Liabilities, Deposits	(449)	0
Other	0	(524)
Deferred tax liabilities	(5,547)	(11,430)
Deferred tax assets:
Property and equipment	5,427	1,082
Incentive and vacation accrual	4,576	2,640
Deferred revenue - key money	1,095	1,703
Allowance for doubtful accounts	128	72
Deferred Tax Assets, Partnership Basis	918	0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies	301	0
Other	357	605
Other carryforwards	184	155
Net operating loss carryforwards	64,546	49,787
Deferred Tax Assets, Historic Tax Credits	824	0
Valuation allowance	(21,595)	(11,430)
Deferred tax assets	$ 56,761	$ 44,614