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Employee Benefit Plans (Consolidated Net Periodic Benefit Costs) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Pension Benefits [Member]
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| Components of net periodic pension and postretirement benefit expense: | |||
| Service cost | $ 13,901 | $ 12,222 | $ 9,628 |
| Interest cost | 5,368 | 4,862 | 4,343 |
| Expected return on plan assets | (6,228) | (5,066) | (4,357) |
| Amortization of prior service cost (credit) | 307 | 307 | 307 |
| Amortization of net actuarial loss | 4,334 | 3,605 | 1,424 |
| Settlement | 0 | 0 | 70 |
| Net periodic expense (credit) | 17,682 | 15,930 | 11,415 |
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Other Postretirement Benefits [Member]
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| Components of net periodic pension and postretirement benefit expense: | |||
| Service cost | 288 | 396 | 430 |
| Interest cost | 412 | 821 | 999 |
| Expected return on plan assets | 0 | 0 | 0 |
| Amortization of prior service cost (credit) | (3,712) | (1,971) | (851) |
| Amortization of net actuarial loss | 1,035 | 1,021 | 167 |
| Settlement | 0 | 0 | 0 |
| Net periodic expense (credit) | $ (1,977) | $ 267 | $ 745 |