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Retirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 20,327 | $ 17,858
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7,007 | 6,710
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 13,320 | 11,148
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 | 1,321 | 680
Mid Cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,321 | 680
Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,930 | 3,553
Large Cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,930 | 3,553
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,300 | 2,010
International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,300 | 2,010
Liability Driven Solution |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,845 | 2,522
Liability Driven Solution | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,845 | 2,522
Wells Fargo BlackRock International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 859 | 727
Wells Fargo BlackRock International Equity | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 859 | 727
Wells Fargo Core Bond |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,416 | 1,254
Wells Fargo Core Bond | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,416 | 1,254
Wells Fargo/Causeway |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 861 | 741
Wells Fargo/Causeway | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 861 | 741
Wells Fargo BlackRock Large Cap Growth Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,146 | 1,009
Wells Fargo BlackRock Large Cap Growth Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,146 | 1,009
Wells Fargo BlackRock Large Cap Value Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,146 | 1,006
Wells Fargo BlackRock Large Cap Value Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,146 | 1,006
Wells Fargo Multi-Manager Small Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,387 | 1,189
Wells Fargo Multi-Manager Small Cap | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,387 | 1,189
Wells Fargo Russell 2000 Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 636 | 560
Wells Fargo Russell 2000 Index Fund | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 636 | 560
Wells Fargo S&P Mid Cap Index Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 715 | 630
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 | 715 | 630
Wells Fargo/MFS Value CIT F |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 578 | 501
Wells Fargo/MFS Value CIT F | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 578 | 501
Wells Fargo/T. Rowe Price I Large-Cap Growth Managed CIT |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 | 505
Wells Fargo/T. Rowe Price I Large-Cap Growth Managed CIT | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 | 505
Wells Fargo/T. Rowe Price Equity Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 | 504
Wells Fargo/T. Rowe Price Equity Income | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 | 504
Wells Fargo Voya Large Cap Growth CIT F |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 |
Wells Fargo Voya Large Cap Growth CIT F | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 577 |
Cash & Short-term Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 456 | 467
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 | $ 456 | $ 467

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