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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | ||||
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Dec. 31, 2013
Pension Benefits
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Dec. 31, 2012
Pension Benefits
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Dec. 31, 2011
Pension Benefits
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Jan. 31, 2013
Pension Benefits
Consolidated plans
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Dec. 31, 2013
Other Postretirement Benefits
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Dec. 31, 2012
Other Postretirement Benefits
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Dec. 31, 2011
Other Postretirement Benefits
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| Change in Benefit Obligation | |||||||
| Benefit obligation at beginning of year | $ 91,746,000 | $ 82,667,000 | $ 27,154,000 | $ 25,296,000 | |||
| Service cost | 211,000 | 250,000 | 204,000 | ||||
| Interest cost | 3,571,000 | 3,700,000 | 3,816,000 | 907,000 | 1,054,000 | 1,301,000 | |
| Participants' contributions | 60,000 | 83,000 | |||||
| Actuarial (gain)/loss | (9,296,000) | 8,863,000 | (4,626,000) | 2,272,000 | |||
| Benefits paid | (3,467,000) | (3,484,000) | (1,554,000) | (1,801,000) | |||
| Benefit obligation at end of year | 82,554,000 | 91,746,000 | 82,667,000 | 22,152,000 | 27,154,000 | 25,296,000 | |
| Change in Assets | |||||||
| Fair value of assets at beginning of year | 59,976,000 | 53,338,000 | |||||
| Actual return on assets | 5,162,000 | 8,220,000 | |||||
| Employer contribution | 24,351,000 | 2,396,000 | 24,000,000 | 1,494,000 | 1,718,000 | ||
| Participants' contributions | 60,000 | 83,000 | |||||
| Expense | (543,000) | (494,000) | |||||
| Benefits paid | (3,467,000) | (3,484,000) | (1,554,000) | (1,801,000) | |||
| Fair value of assets at end of year | 85,479,000 | 59,976,000 | 53,338,000 | ||||
| Reconciliation of funded status of defined benefit plan | |||||||
| Projected benefit obligation | 82,554,000 | 91,746,000 | 82,667,000 | 22,152,000 | 27,154,000 | 25,296,000 | |
| Fair value of plan assets | 85,479,000 | 59,976,000 | 53,338,000 | ||||
| Accrued pension (benefit) cost | (2,925,000) | 31,770,000 | 22,152,000 | 27,154,000 | |||
| Improved projected benefit obligation funded status (as a percent) | 95.70% | ||||||
| Amounts recognized in accumulated other comprehensive income | |||||||
| Net loss | 23,909,000 | 33,670,000 | 4,420,000 | 9,518,000 | |||
| Prior service cost | (2,576,000) | (3,102,000) | |||||
| Transition obligation | 164,000 | 327,000 | |||||
| Accumulated pension benefit obligations | $ 82,600,000 | $ 91,700,000 | |||||