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BENEFIT PLANS (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Pension Benefits [Member]
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| Net periodic benefit cost [Abstract] | ||||
| Service cost | $ 985,000 | $ 848,000 | $ 2,955,000 | $ 2,544,000 |
| Interest cost | 1,029,000 | 1,098,000 | 3,086,000 | 3,295,000 |
| Expected return on plan assets | (2,710,000) | (2,299,000) | (7,612,000) | (6,897,000) |
| Amortization of unrecognized net loss | 1,008,000 | 922,000 | 3,023,000 | 2,765,000 |
| Amortization of prior service cost | 14,000 | (37,000) | 43,000 | (110,000) |
| Net periodic benefit cost | 326,000 | 532,000 | 1,495,000 | 1,597,000 |
| Employer contributions in current fiscal year | 10,000,000 | |||
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Post-retirement Benefits [Member]
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| Net periodic benefit cost [Abstract] | ||||
| Service cost | 0 | 0 | 0 | 0 |
| Interest cost | 22,000 | 29,000 | 66,000 | 86,000 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Amortization of unrecognized net loss | 3,000 | 3,000 | 9,000 | 9,000 |
| Amortization of prior service cost | (45,000) | (206,000) | (134,000) | (617,000) |
| Net periodic benefit cost | $ (20,000) | $ (174,000) | $ (59,000) | $ (522,000) |