Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Components of Deferred Tax Assets [Abstract]
Domestic net operating loss carryforwards	$ 96,777	$ 94,598
Interest expense deduction limitation carryforward	2,495	0
Foreign net operating loss carryforward	9,582	11,619
Intangibles	14,875	18,058
Property and equipment	5,291	9,280
Employee benefits and insurance claims accruals	5,374	5,652
Employee stock-based compensation	3,271	3,753
Accounts receivable reserve	325	284
Inventory	236	295
Accrued expenses	190	0
Deferred revenue	560	316
Deferred Tax Assets, Gross	138,976	143,855
Deferred Tax Assets, Valuation Allowance	(62,639)	(59,766)
Components of Deferred Tax Liabilities [Abstract]
Accrued expenses	(419)	(112)
Property and equipment	(79,606)	(87,128)
Net deferred tax liabilities	$ (3,688)	$ (3,151)