Income Taxes - Carrying amounts of assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax liabilities
Accelerated depreciation	$ (6,468)	$ (5,147)
Prepaid expenses	(1,238)	(302)
Intangible assets	(3,474)	(3,501)
Other		(305)
Total deferred tax liabilities	(11,180)	(9,255)
Deferred tax assets
Investment impairment	21,974	21,647
Inventory related	6,479	170
Gift cards	1,478	744
Deferred revenues	322	304
Accrual for employee benefits and severance	1,401	1,221
Stock option expense	440	218
Investment in partnership	208,749	208,559
Tax Receivable Agreement liability	34,184	35,319
AMT credit		609
Net operating loss carryforward	51,654	17,518
Claims reserves	126	440
Intangible assets	547	113
Goodwill	3,836	996
Deferred book gain	770	851
Other reserves	6,146	5,697
Gross deferred tax assets	338,106	294,406
Valuation allowance	(180,983)	(132,468)
Net deferred tax assets	$ 145,943	$ 152,683