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Pension Benefit and Retirement Health and Life Insurance Benefits (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 171,007 | $ 170,600 | $ 171,218
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 43,454 | 51,097 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 117,209 | 107,739 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 10,344 | 11,764 |
Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 6,782 | 5,204 |
Pooled separate accounts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Pooled separate accounts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 6,782 | 5,204 |
Pooled separate accounts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Fixed income bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 110,427 | 102,535 |
Fixed income bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Fixed income bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 110,427 | 102,535 |
Fixed income bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 43,454 | 51,097 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 43,454 | 51,097 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 10,344 | 11,764 |
Guaranteed deposit account | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 10,344 | $ 11,764 |

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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