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Retirement Plans (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plan Investments
Money market account	$ 9,958	$ 1,690
Mutual funds	124,620	92,026
Common / collective trust funds	89,848	79,706
Total pension plan investments	224,426	173,422
Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
Money market account	9,958	1,690
Mutual funds	124,620	92,026
Common / collective trust funds	0	0
Total pension plan investments	134,578	93,716
Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
Money market account	0	0
Mutual funds	0	0
Common / collective trust funds	89,848	79,706
Total pension plan investments	89,848	79,706
Fair Value, Inputs, Level 3 [Member]
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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