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Retirement Plans - Fair Value of Plan Assets by Investment Type (Details) (Pension plan, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 8,633	$ 6,799	$ 5,722
Cash and Cash Equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,336	231
Collective Funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,851	3,449
Treasury/Corporate Notes \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,357	1,129
Corporate Equities \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,089	$ 1,990

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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