Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of fair values of pension plan assets
Total Plan Assets	$ 35,067	$ 32,420	$ 34,364
Quoted Prices in Active Markets (Level 1) [Member]
Summary of fair values of pension plan assets
Total Plan Assets	25,448
Quoted Prices in Active Markets (Level 1) [Member] \| U.S. Large Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	13,441
Quoted Prices in Active Markets (Level 1) [Member] \| U.S. Mid Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	1,444
Quoted Prices in Active Markets (Level 1) [Member] \| U.S. Small Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	711
Quoted Prices in Active Markets (Level 1) [Member] \| World Equity [Member]
Summary of fair values of pension plan assets
Total Plan Assets	2,933
Quoted Prices in Active Markets (Level 1) [Member] \| Real Estate [Member]
Summary of fair values of pension plan assets
Total Plan Assets	895
Quoted Prices in Active Markets (Level 1) [Member] \| Other [Member]
Summary of fair values of pension plan assets
Total Plan Assets	756
Quoted Prices in Active Markets (Level 1) [Member] \| Fixed income securities [Member]
Summary of fair values of pension plan assets
Total Plan Assets	4,389
Quoted Prices in Active Markets (Level 1) [Member] \| Cash and cash equivalents [Member]
Summary of fair values of pension plan assets
Total Plan Assets	879
Significant Other Observable Inputs (Level 2) [Member]
Summary of fair values of pension plan assets
Total Plan Assets	9,619
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Large Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Mid Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Small Cap [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| World Equity [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| Real Estate [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| Other [Member]
Summary of fair values of pension plan assets
Total Plan Assets	0
Significant Other Observable Inputs (Level 2) [Member] \| Fixed income securities [Member]
Summary of fair values of pension plan assets
Total Plan Assets	9,619
Significant Other Observable Inputs (Level 2) [Member] \| Cash and cash equivalents [Member]
Summary of fair values of pension plan assets
Total Plan Assets	$ 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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