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Employee Benefit Plans (Schedule of Defined Benefit Plans' Assets at Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 65,890	$ 58,148	$ 59,423
U.S. small cap equity funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,637	6,742
U.S. mid-cap equity funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,626	16,037
U.S. large-cap equity funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,848	5,236
International equity funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,083	11,229
Domestic real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,640	3,136
Corporate bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,510	15,459
Money market fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 546	$ 309

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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