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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Gross deferred income tax assets: |  |
Workers' compensation claims liabilities | $ 4,833 | $ 4,266
Safety incentives payable | 3,422 | 2,064
Allowance for doubtful accounts | 148 | 175
Deferred compensation | 44 | 180
Tax effect of unrealized losses, net | 936 | 883
Alternative minimum tax credit carryforward | 0 | 740
State credit carryforward | 805 | 490
State loss carryforward | 0 | 15
Other | 284 | 305
Deferred Tax Assets, Gross, Total | 10,472 | 9,118
Less valuation allowance | 1,773 | 1,333
Deferred Tax Assets, Net Total | 8,699 | 7,785
Gross deferred income tax liabilities: |  |
Tax depreciation in excess of book depreciation | (2,017) | (1,851)
Tax amortization of goodwill | (9,141) | (8,128)
Deferred Tax Liabilities, Gross, Total | (11,158) | (9,979)
Net deferred income tax liabilities | $ (2,459) | $ (2,194)

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