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Retirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 25,274 | $ 21,838
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11,446 | 11,124
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 13,828 | 10,714
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Small Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Small Cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Small Cap | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Small Cap | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,577 | 1,376
Mid Cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,577 | 1,376
Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,826 | 7,126
Large Cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,826 | 7,126
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,531 | 2,201
International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,531 | 2,201
Wells Fargo Liability Driven Solution |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,521 | 3,074
Wells Fargo Liability Driven Solution | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Wells Fargo Liability Driven Solution | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,521 | 3,074
Wells Fargo Liability Driven Solution | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Wells Fargo International Equity Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,286 | 1,097
Wells Fargo International Equity Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,286 | 1,097
Wells Fargo Thornburg International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,273 | 1,103
Wells Fargo Thornburg International | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,273 | 1,103
Wells Fargo Large Cap Growth Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,423 | 1,216
Wells Fargo Large Cap Growth Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,423 | 1,216
Wells Fargo Large Cap Value Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,427 | 1,210
Wells Fargo Large Cap Value Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,427 | 1,210
Wells Fargo Multi-Manager Small Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,683 | 1,481
Wells Fargo Multi-Manager Small Cap | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,683 | 1,481
Wells Fargo Russell 2000 Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 841 | 708
Wells Fargo Russell 2000 Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 841 | 708
Wells Fargo S&P Mid Cap Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 950 | 825
Wells Fargo S&P Mid Cap Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 950 | 825
T Rowe Price Equity Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,424 |
T Rowe Price Equity Income | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,424 |
Cash & Short-term Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 512 | 421
Cash & Short-term Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 512 | $ 421

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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