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Retirement Plans (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Plan Investments
Money market account	$ 1,690	$ 861
Mutual funds	92,026	78,046
Common / collective trust funds	79,706	80,884
Total pension plan investments	173,422	159,791
Fair Value, Inputs, Level 1
Pension Plan Investments
Money market account	1,690	861
Mutual funds	92,026	78,046
Common / collective trust funds	0	0
Total pension plan investments	93,716	78,907
Fair Value, Inputs, Level 2
Pension Plan Investments
Money market account	0	0
Mutual funds	0	0
Common / collective trust funds	79,706	80,884
Total pension plan investments	79,706	80,884
Fair Value, Inputs, Level 3
Pension Plan Investments
Money market account	0	0
Mutual funds	0	0
Common / collective trust funds	0	0
Total pension plan investments	$ 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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