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Benefit Obligations (Details 10) (Post-retirement Benefits [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fair values of the assets for the post-retirement benefit plan by asset category
Total	$ 66,968	$ 66,781	$ 62,300
Level 1 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Level 2 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	66,968	66,781
Level 3 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - domestic equities [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	13,302	13,310
Commingled funds - domestic equities [Member] \| Level 1 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - domestic equities [Member] \| Level 2 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	13,302	13,310
Commingled funds - domestic equities [Member] \| Level 3 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - international equities [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	13,536	13,369
Commingled funds - international equities [Member] \| Level 1 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - international equities [Member] \| Level 2 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	13,536	13,369
Commingled funds - international equities [Member] \| Level 3 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - bonds [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	40,130	40,102
Commingled funds - bonds [Member] \| Level 1 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	0	0
Commingled funds - bonds [Member] \| Level 2 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	40,130	40,102
Commingled funds - bonds [Member] \| Level 3 [Member]
Fair values of the assets for the post-retirement benefit plan by asset category
Total	$ 0	$ 0

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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