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Retirement Plans (Quantitative Disclosures of Retirement Income Plan's Invested Assets that are Measured at Fair Value on a Recurring Basis) (Details) (Retirement Income Plan [Member], USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | $ 225,817,000 | $ 207,150,000 | $ 182,614,000
Fair Value [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 225,966,000 | 207,088,000 |
Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 205,471,000 | 174,014,000 |
Fair Value [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 12,159,000 | 12,631,000 |
Fair Value [Member] | Equity Securities [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,350,000 | 17,835,000 |
Fair Value [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 963,000 | 1,629,000 |
Fair Value [Member] | Deposit Administration Contracts [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 1,023,000 | 979,000 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 200,810,000 | 183,752,000 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 193,497,000 | 164,288,000 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Equity Securities [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,350,000 | 17,835,000 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 963,000 | 1,629,000 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Deposit Administration Contracts [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 12,997,000 | 10,705,000 |
Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 11,974,000 | 9,726,000 |
Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Deposit Administration Contracts [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 1,023,000 | 979,000 |
Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 12,159,000 | 12,631,000 |
Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 12,159,000 | 12,631,000 | 15,180,000
Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 12,159,000 | 12,631,000 |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Deposit Administration Contracts [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
International equity [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 17,548,000 | 15,751,000 |
International equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 5,574,000 | 6,025,000 |
International equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 11,974,000 | 9,726,000 |
International equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Domestic large capitalization [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 30,436,000 | 22,910,000 |
Domestic large capitalization [Member] | Fair Value [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 9,938,000 |
Domestic large capitalization [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 30,436,000 | 22,910,000 |
Domestic large capitalization [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 9,938,000 |
Domestic large capitalization [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Domestic large capitalization [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 0 |
Domestic large capitalization [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Domestic large capitalization [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 0 |
Small And Mid Capitalization Securities [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,326,000 | 6,805,000 |
Small And Mid Capitalization Securities [Member] | Fair Value [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,350,000 | 7,897,000 |
Small And Mid Capitalization Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,326,000 | 6,805,000 |
Small And Mid Capitalization Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 6,350,000 | 7,897,000 |
Small And Mid Capitalization Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Small And Mid Capitalization Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Small And Mid Capitalization Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Small And Mid Capitalization Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Global Asset Allocation [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 27,257,000 | 20,778,000 |
Global Asset Allocation [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 27,257,000 | 20,778,000 |
Global Asset Allocation [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Global Asset Allocation [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Extended Duration Fixed Maturity [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 96,920,000 | 50,556,000 |
Extended Duration Fixed Maturity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 96,920,000 | 50,556,000 |
Extended Duration Fixed Maturity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Extended Duration Fixed Maturity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Domestic Core Fixed Maturity [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 29,984,000 |
Domestic Core Fixed Maturity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 29,984,000 |
Domestic Core Fixed Maturity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 0 |
Domestic Core Fixed Maturity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets |  | 0 |
Global bond high yield emerging markets [Member] | Fair Value [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 26,984,000 | 27,230,000 |
Global bond high yield emerging markets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 26,984,000 | 27,230,000 |
Global bond high yield emerging markets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Global bond high yield emerging markets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment Funds [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Equity Long Short Hedge [Member] | Fair Value [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 41,000 | 41,000 |
Equity Long Short Hedge [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Equity Long Short Hedge [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Equity Long Short Hedge [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 41,000 | 41,000 |
Private Equity [Member] | Fair Value [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 9,899,000 | 10,385,000 |
Private Equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Private Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Private Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 9,899,000 | 10,385,000 |
Real Estate Strategy [Member] | Fair Value [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 2,219,000 | 2,205,000 |
Real Estate Strategy [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Real Estate Strategy [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | 0 | 0 |
Real Estate Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets | $ 2,219,000 | $ 2,205,000 |

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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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