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Benefit Plans Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 Y | Dec. 31, 2012 | Dec. 31, 2011
Pension Plans [Abstract] |  |  |
Number of compensation years included in benefit calculation | 3 |  |
Expected future working lifetime of participants | 12 years 2 months 27 days |  |
Market gains (losses) | $ (334,000) | $ 649,000 |
Return on investments since plan inception, percent | 11.20% |  |
Investments benchmark since inception, percent | 10.40% |  |
Return on investments for 2012, percent | 14.70% |  |
Investments benchmark for 2012, percent | 11.90% |  |
Flexible Spending Plan [Abstract] |  |  |
Annual maximum contribution limit under Health Care Spending Account plan | 2,500.0 |  |
Annual maximum contribution limit under Dependent Care Spending Account plan | 5,000 |  |
Deferral Plan [Abstract] |  |  |
Employer contributions to deferral plan | 1,087,000 | 1,044,000 | 1,001,000
Fixed Income Funds [Member] |  |  |
Pension Plans [Abstract] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 25.00% |  |
Bonds [Member] |  |  |
Pension Plans [Abstract] |  |  |
Actual plan asset allocations | 38.00% |  |
Cash and Cash Equivalents [Member] |  |  |
Pension Plans [Abstract] |  |  |
Actual plan asset allocations | 9.00% |  |
Equity Securities [Member] |  |  |
Pension Plans [Abstract] |  |  |
Actual plan asset allocations | 53.00% |  |
Minimum [Member] |  |  |
Pension Plans [Abstract] |  |  |
Period for performance standards | 3 years |  |
Maximum [Member] |  |  |
Pension Plans [Abstract] |  |  |
Period for performance standards | 5 years |  |
Maximum [Member] | Private Corporation Assets [Member] |  |  |
Pension Plans [Abstract] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 5.00% |  |
Executive Supplemental Retirement Plan [Member] |  |  |
Pension Plans [Abstract] |  |  |
Projected benefit obligation | 12,637,000 | 13,130,000 |
Net periodic pension cost | 1,248,000 | 1,386,000 | 1,241,000
Executives and Non-employee Directors [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] |  |  |
Special Deferral Election Plan and Deferral Election Program [Abstract] |  |  |
Deferrals by executives and non-employee directors | $ 2,567,000 | $ 2,501,000 | $ 2,306,000

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- Definition Deferred Compensation Arrangement With Individual, Deferral Amount + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Number of Compensation Years + References No definition available. + Details
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- Definition Defined Benefit Plan, Unamortized Actuarial Gains (Losses), Expected Working Lifetime of Participants + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -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 -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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