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Income Taxes (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss before income taxes |  |  |  |
Domestic |  | $ (31,714,000) | $ (41,162,000) | $ (36,230,000)
Foreign |  | (4,866,000) | (5,079,000) | (3,804,000)
Loss before income tax |  | (36,580,000) | (46,241,000) | (40,034,000)
Income tax benefit |  |  |  |
Current federal benefit |  | 40,000 | 215,000 | 280,000
Current state benefit (expense) |  | 3,545,000 | 181,000 | (571,000)
Current foreign benefit |  | 2,492,000 |  |
Deferred federal (expense) benefit |  | (51,000) | 5,795,000 | 12,499,000
Deferred state benefit (expense) |  | 697,000 | (847,000) | 860,000
Deferred foreign (expense) benefit |  | (1,409,000) | 1,105,000 | 687,000
Total income tax benefit (expense) |  | $ 5,314,000 | $ 6,449,000 | $ 13,755,000
Reconciliation of income tax provision |  |  |  |
Federal income tax rate (as a percent) | 21.00% | 35.00% | 35.00% | 35.00%
Tax benefit computed at statutory rate of 35% |  | $ 12,803,000 | $ 16,184,000 | $ 14,012,000
Change in valuation allowance |  | (4,564,000) | (10,200,000) | (502,000)
State income tax benefit (expense), net of federal tax |  | 2,757,000 | (433,000) | 423,000
Foreign losses |  | 1,593,000 | 985,000 | 954,000
Transaction costs |  |  |  | (445,000)
Tax reform impact to deferred tax balances |  | (7,590,000) |  |
Other |  | 315,000 | (87,000) | (687,000)
Total income tax benefit (expense) |  | 5,314,000 | 6,449,000 | 13,755,000
Deferred tax assets: |  |  |  |
Federal tax net operating loss ("NOL") carryforward |  | 21,014,000 | 32,746,000 |
Foreign tax NOL carryforward |  | 4,410,000 | 4,486,000 |
Deferred revenue |  | 626,000 | 462,000 |
Restricted stock and restricted stock unit awards |  | 192,000 | 318,000 |
Workers' compensation |  | 64,000 | 74,000 |
State tax NOL carryforward |  | 1,529,000 | 1,223,000 |
Self-insurance |  | 128,000 | 219,000 |
Canadian start-up costs |  | 156,000 | 275,000 |
Alternative Minimum Tax ("AMT") credit carryforward |  | 315,000 | 315,000 |
Foreign tax credit |  |  | 1,874,000 |
Foreign deferred taxes |  | 874,000 | (535,000) |
Other comprehensive income |  | 242,000 | 786,000 |
Uncertain tax positions |  |  | 512,000 |
Other |  | 80,000 | 271,000 |
Gross deferred tax assets |  | 29,630,000 | 43,026,000 |
Less valuation allowances |  | (17,366,000) | (13,602,000) |
Net deferred tax assets |  | 12,264,000 | 29,424,000 |
Deferred tax liabilities: |  |  |  |
Property and equipment |  | (12,914,000) | (29,035,000) |
Total net deferred tax liabilities |  | (650,000) |  |
Total net deferred tax assets |  |  | 389,000 |
Roll Forward of the Company's unrecognized tax benefits: |  |  |  |
Balance at beginning of year |  | 1,489,000 | 1,684,000 |
Decrease in prior year tax positions |  |  | (14,000) |
Increase in current year tax positions |  |  | 157,000 |
Liability statute expiration |  | (1,489,000) | (338,000) |
Balance at end of year |  |  | 1,489,000 | $ 1,684,000
Canada |  |  |  |
Deferred tax liabilities: |  |  |  |
Net operating loss carry forwards |  | 16,963,000 |  |
Foreign |  |  |  |
Deferred tax liabilities: |  |  |  |
Total net deferred tax liabilities |  | (874,000) |  |
Total net deferred tax assets |  |  | 535,000 |
Federal |  |  |  |
Deferred tax liabilities: |  |  |  |
Total net deferred tax liabilities |  |  | $ (146,000) |
Total net deferred tax assets |  | 224,000 |  |
Net operating loss carry forwards |  | 100,065,000 |  |
State |  |  |  |
Deferred tax liabilities: |  |  |  |
Net operating loss carry forwards |  | $ 1,935,000 |  |

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