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Retirement Plans and Other Postretirement Benefits - Fair Value Disclosures (Details 9) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures
Total fair value of plan assets	$ 34,420	$ 25,213
Common Stock [Member] \| Level 1 [Member]
Fair Value Disclosures
Total fair value of plan assets		8,056
Mutual fund [Member] \| Level 1 [Member] \| U.S. Large Cap [Member]
Fair Value Disclosures
Total fair value of plan assets	12,880
Mutual fund [Member] \| Level 1 [Member] \| U.S. Mid Cap [Member]
Fair Value Disclosures
Total fair value of plan assets	1,649	986
Mutual fund [Member] \| Level 1 [Member] \| U.S. Small Cap [Member]
Fair Value Disclosures
Total fair value of plan assets	1,675	991
Mutual fund [Member] \| Level 1 [Member] \| International [Member]
Fair Value Disclosures
Total fair value of plan assets	4,164	2,202
Mutual fund [Member] \| Level 1 [Member] \| Income [Member]
Fair Value Disclosures
Total fair value of plan assets	899	1,577
Short Term Investments [Member] \| Level 1 [Member]
Fair Value Disclosures
Total fair value of plan assets	916	1,250
U.S. government obligations [Member] \| Level 2 [Member]
Fair Value Disclosures
Total fair value of plan assets	2,834	2,359
Corporate bonds [Member] \| Level 2 [Member]
Fair Value Disclosures
Total fair value of plan assets	4,900	4,203
Certificates of Deposit [Member] \| Level 3 [Member]
Fair Value Disclosures
Total fair value of plan assets	$ 4,503	$ 3,589

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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