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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)