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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss before income taxes      
Domestic $ (20,577,000) $ (32,238,000) $ (39,214,000)
Foreign (4,628,000) (4,866,000) (5,079,000)
Loss before income tax (25,205,000) (37,104,000) (44,293,000)
Income tax benefit      
Current federal benefit 55,000 40,000 215,000
Current state (expense) benefit (14,000) 3,545,000 181,000
Current foreign benefit   2,492,000  
Deferred federal (expense) benefit (274,000) (51,000) 5,326,000
Deferred state benefit (expense) 344,000 697,000 (867,000)
Deferred foreign benefit (expense) 687,000 (1,409,000) 1,105,000
Total income tax benefit $ 798,000 $ 5,314,000 $ 5,960,000
Reconciliation of income tax provision      
Federal income tax rate (as a percent) 21.00% 35.00% 35.00%
Tax benefit computed at statutory rate of 21% and 35% $ 5,293,000 $ 12,986,000 $ 15,503,000
Change in valuation allowance (5,811,000) (4,747,000) (9,995,000)
State income tax benefit (expense), net of federal tax 260,000 2,757,000 (446,000)
Foreign losses 1,319,000 1,593,000 985,000
Tax reform impact to deferred tax balances   (7,590,000)  
Other (263,000) 315,000 (87,000)
Total income tax benefit 798,000 5,314,000 5,960,000
Deferred tax assets:      
Federal tax net operating loss ("NOL") carryforward 24,848,000 21,014,000  
Foreign tax NOL carryforward 5,298,000 4,410,000  
Deferred revenue 697,000 626,000  
Restricted stock and restricted stock unit awards 320,000 192,000  
Workers' compensation 60,000 64,000  
State tax NOL carryforward 2,134,000 1,529,000  
Self-insurance 111,000 128,000  
Canadian start-up costs 137,000 156,000  
Alternative Minimum Tax ("AMT") credit carryforward 315,000 315,000  
Foreign deferred taxes 466,000 874,000  
Other comprehensive income 490,000 242,000  
Other 92,000 80,000  
Gross deferred tax assets 34,968,000 29,630,000  
Less valuation allowances (22,806,000) (17,366,000)  
Net deferred tax assets 12,162,000 12,264,000  
Deferred tax liabilities:      
Property and equipment (12,003,000) (12,914,000)  
Total net deferred tax liabilities   (650,000)  
Total net deferred tax assets 159,000    
Roll Forward of the Company's unrecognized tax benefits:      
Balance at beginning of year   1,489,000  
Liability statute expiration   (1,489,000)  
Balance at end of year     $ 1,489,000
Canada      
Deferred tax liabilities:      
Net operating loss carry forwards 20,379,000    
Foreign      
Deferred tax liabilities:      
Total net deferred tax liabilities (134,000) (874,000)  
Federal      
Deferred tax liabilities:      
Total net deferred tax assets 293,000 $ 224,000  
Net operating loss carry forwards 118,326,000    
State      
Deferred tax liabilities:      
Net operating loss carry forwards $ 2,702,000