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Benefit Plans (Fair values of our pension plan assets by asset category) (Details) (USD $)
In Thousands, unless otherwise specified
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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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| Fair values of the Corporations pension plan assets by asset category |
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| Fair values of the Corporation's pension plan assets |
$ 10,508 |
$ 9,650 |
$ 8,603 |
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Short-term investments [Member]
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| Fair values of the Corporations pension plan assets by asset category |
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| Fair values of the Corporation's pension plan assets |
142 |
80 |
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Equity investments [Member]
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| Fair values of the Corporations pension plan assets by asset category |
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|
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| Fair values of the Corporation's pension plan assets |
5,302 |
4,738 |
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Level 2 [Member]
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| Fair values of the Corporations pension plan assets by asset category |
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| Fair values of the Corporation's pension plan assets |
10,508 |
9,650 |
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Level 2 [Member] | Short-term investments [Member]
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| Fair values of the Corporations pension plan assets by asset category |
|
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| Fair values of the Corporation's pension plan assets |
142 |
80 |
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Level 2 [Member] | Equity investments [Member]
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| Fair values of the Corporations pension plan assets by asset category |
|
|
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| Fair values of the Corporation's pension plan assets |
5,302 |
4,738 |
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Fixed income [Member]
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| Fair values of the Corporations pension plan assets by asset category |
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| Fair values of the Corporation's pension plan assets |
5,064 |
4,832 |
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Fixed income [Member] | Level 2 [Member]
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| Fair values of the Corporations pension plan assets by asset category |
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| Fair values of the Corporation's pension plan assets |
$ 5,064 |
$ 4,832 |
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