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Pensions and Other Postemployment Benefits (OPEB) - Components of Net Periodic Benefit Cost (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Jun. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |||||
| Service cost | $ 0 | $ 0 | $ 0 | $ 0 | |
| Interest cost | 1,551 | 1,335 | 4,652 | 4,005 | |
| Expected return on plan assets | (2,582) | (2,307) | (7,743) | (6,921) | |
| Amortization of Unrecognized actuarial net loss | 430 | 598 | 1,289 | 1,794 | |
| Amortization of Unrecognized prior service cost (credit) | 0 | 0 | 0 | 0 | |
| Amortization of Curtailment | 0 | 0 | |||
| Net periodic benefit cost (credit) | (601) | (374) | (1,802) | (1,122) | |
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Other Postemployment Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |||||
| Service cost | 153 | 157 | 459 | 630 | |
| Interest cost | 375 | 329 | 1,124 | 1,040 | |
| Expected return on plan assets | 0 | 0 | 0 | 0 | |
| Amortization of Unrecognized actuarial net loss | 22 | 0 | 65 | 103 | |
| Amortization of Unrecognized prior service cost (credit) | (287) | (289) | (860) | (463) | |
| Amortization of Curtailment | (100) | 0 | (116) | ||
| Net periodic benefit cost (credit) | $ 263 | $ 197 | $ 788 | $ 1,194 | |