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EMPLOYEE BENEFIT PLANS (Details 3) (Nonunion Defined Benefit Pension Plan) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Employee Benefit Plans |  |
Period over which the possibility of experiencing a substantial loss is limited by adequate diversification under the long-term asset allocation policy | 1 year |
Weighted-average asset allocation |  |
Total (as a percent) | 100.00% | 100.00%
Minimum |  |
Target allocations and acceptable ranges |  |
Performance period of recognized market indices used to compare investment performance | 3 years |
Maximum |  |
Target allocations and acceptable ranges |  |
Performance period of recognized market indices used to compare investment performance | 5 years |
Large Cap U.S. Equity |  |
Weighted-average asset allocation |  |
Total (as a percent) | 32.10% | 31.10%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 30.00% |
Acceptable Range, minimum (as a percent) | 25.00% |
Acceptable Range, maximum (as a percent) | 35.00% |
Mid Cap U.S. Equity |  |
Weighted-average asset allocation |  |
Total (as a percent) | 11.10% | 10.30%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 10.00% |
Acceptable Range, minimum (as a percent) | 8.00% |
Acceptable Range, maximum (as a percent) | 12.00% |
Small Cap U.S. Equity |  |
Weighted-average asset allocation |  |
Total (as a percent) | 11.10% | 10.50%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 10.00% |
Acceptable Range, minimum (as a percent) | 8.00% |
Acceptable Range, maximum (as a percent) | 12.00% |
International Equity |  |
Weighted-average asset allocation |  |
Total (as a percent) | 11.10% | 8.40%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 10.00% |
Acceptable Range, minimum (as a percent) | 8.00% |
Acceptable Range, maximum (as a percent) | 12.00% |
Emerging Market Equity |  |
Weighted-average asset allocation |  |
Total (as a percent) | 5.00% | 5.50%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 5.00% |
Acceptable Range, minimum (as a percent) | 3.00% |
Acceptable Range, maximum (as a percent) | 7.00% |
Debt Instruments |  |
Weighted-average asset allocation |  |
Total (as a percent) | 22.40% | 16.60%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 20.00% |
Acceptable Range, minimum (as a percent) | 15.00% |
Acceptable Range, maximum (as a percent) | 30.00% |
Floating Rate Loan Fund |  |
Weighted-average asset allocation |  |
Total (as a percent) | 4.00% | 4.10%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 5.00% |
Acceptable Range, minimum (as a percent) | 3.00% |
Acceptable Range, maximum (as a percent) | 7.00% |
Cash and Cash Equivalents |  |
Weighted-average asset allocation |  |
Total (as a percent) | 3.20% | 13.50%
Target allocations and acceptable ranges |  |
Target allocation (as a percent) | 10.00% |
Acceptable Range, minimum (as a percent) | 0.00% |
Acceptable Range, maximum (as a percent) | 15.00% |
Actively managed portfolio of short-term debt instruments |  |
Target allocations and acceptable ranges |  |
Maximum maturity period of investments under investment restrictions | 7 years |
Maximum percentage of portfolio investments under investment restrictions represented by a single issue or issuer other than U.S. government securities | 5.00% |
Maximum percentage of portfolio under investment restrictions invested in BBB rated debt or collectively in mortgage-backed securities and asset-backed securities | 25.00% |
Actively managed portfolio of short duration debt instruments |  |
Target allocations and acceptable ranges |  |
Maximum average effective duration period of investments under investment restrictions | 3 years |

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