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INCOME TAXES (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
INCOME TAXES |  |  |  |
State tax, low end of range of rate (as a percent) |  |  | 6.00% |
State tax, high end of range of rate (as a percent) |  |  | 6.50% |
Net decrease in valuation allowance |  | $ 8,000,000 | $ 300,000 | $ 3,300,000
Alternative fuel tax credit, prior year |  |  | 900,000 |
Alternative fuel tax credit, current year |  |  | 500,000 |
Reduction in net deferred tax assets due to nonunion defined benefit pension plan curtailment | 18,000,000 |  |  |
Reduction in pension liability due to nonunion defined benefit pension plan curtailment | 46,300,000 |  |  |
Refund of federal and state taxes |  |  | 2,200,000 |
State and foreign income taxes paid |  |  | 900,000 |
Reconciliation between the effective income tax rate, as computed on income (loss) before income taxes, and the statutory federal income tax rate |  |  |  |
Income tax expense (benefit) at the statutory federal rate | 2,753,000 | 2,129,000 | (5,403,000) | (5,758,000)
Federal income tax effects of: |  |  |  |
Net reversal in valuation allowances | (528,000) | (7,973,000) | (216,000) | (3,333,000)
Alternative fuel tax credit | (241,000) |  | (1,421,000) |
Effect of permanent differences and other | 703,000 | (635,000) | 721,000 | (871,000)
State income taxes | 300,000 | 722,000 | (602,000) | (169,000)
Total income tax expense (benefit) | $ 2,987,000 | $ (5,757,000) | $ (6,921,000) | $ (10,131,000)
Income tax expense (benefit) at the statutory federal rate (as a percent) | 35.00% | 35.00% | (35.00%) | (35.00%)
Federal income tax effects of: |  |  |  |
Net reversal in valuation allowances (as a percent) | (6.70%) | (131.00%) | (1.40%) | (20.30%)
Alternative fuel tax credit (as a percent) | (3.00%) |  | (9.20%) |
Effect of permanent differences and other (as a percent) | 8.90% | (10.40%) | 4.70% | (5.30%)
State income taxes (as a percent) | 3.80% | 11.80% | (3.90%) | (1.00%)
Total income tax expense (benefit) (as a percent) | 38.00% | (94.60%) | (44.80%) | (61.60%)

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