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Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 286,598,000 | $ 254,556,000
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4,314,000 | 3,786,000
Common and collective trusts | International small cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15,845,000 | 12,725,000
Common and collective trusts | Global/International equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21,198,000 | 16,656,000
Common and collective trusts | Domestic equity – small/mid cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 17,339,000
Common and collective trusts | International equity emerging markets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 17,809,000 | 17,672,000
Common stock | Industrials |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,307,000 | 9,475,000
Common stock | Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,663,000 | 1,966,000
Common stock | Consumer |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,002,000 | 8,270,000
Common stock | Healthcare |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,013,000 | 7,386,000
Common stock | Finance |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11,566,000 | 13,000,000
Common stock | Utilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,711,000 | 2,305,000
Common stock | Information technology |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,785,000 | 6,828,000
Common stock | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,175,000 | 6,078,000
Mutual funds | Foreign large blend |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,492,000 | 18,907,000
Mutual funds | Long-term bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 137,031,000 | 114,557,000
Mutual funds | Mid-cap Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,009,000 |
Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1,073,000
Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 286,920,000 | 258,023,000
Payable held under securities lending agreement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | (322,000) | (3,467,000)
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4,314,000 | 3,786,000
Fair Value, Inputs, Level 1 | Common and collective trusts | International small cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 1 | Common and collective trusts | Global/International equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 1 | Common and collective trusts | Domestic equity – small/mid cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 1 | Common and collective trusts | International equity emerging markets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 1 | Common stock | Industrials |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,307,000 | 9,475,000
Fair Value, Inputs, Level 1 | Common stock | Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,663,000 | 1,966,000
Fair Value, Inputs, Level 1 | Common stock | Consumer |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,002,000 | 8,270,000
Fair Value, Inputs, Level 1 | Common stock | Healthcare |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,013,000 | 7,386,000
Fair Value, Inputs, Level 1 | Common stock | Finance |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11,566,000 | 13,000,000
Fair Value, Inputs, Level 1 | Common stock | Utilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,711,000 | 2,305,000
Fair Value, Inputs, Level 1 | Common stock | Information technology |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,785,000 | 6,828,000
Fair Value, Inputs, Level 1 | Common stock | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,175,000 | 6,078,000
Fair Value, Inputs, Level 1 | Mutual funds | Foreign large blend |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,492,000 | 18,907,000
Fair Value, Inputs, Level 1 | Mutual funds | Long-term bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 137,031,000 | 114,557,000
Fair Value, Inputs, Level 1 | Mutual funds | Mid-cap Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,009,000 |
Fair Value, Inputs, Level 1 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 1 | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 232,068,000 | 192,558,000
Fair Value, Inputs, Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common and collective trusts | International small cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15,845,000 | 12,725,000
Fair Value, Inputs, Level 2 | Common and collective trusts | Global/International equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21,198,000 | 16,656,000
Fair Value, Inputs, Level 2 | Common and collective trusts | Domestic equity – small/mid cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 17,339,000
Fair Value, Inputs, Level 2 | Common and collective trusts | International equity emerging markets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 17,809,000 | 17,672,000
Fair Value, Inputs, Level 2 | Common stock | Industrials |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Consumer |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Healthcare |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Finance |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Utilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Information technology |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Common stock | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Mutual funds | Foreign large blend |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Mutual funds | Long-term bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 | Mutual funds | Mid-cap Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Fair Value, Inputs, Level 2 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1,073,000
Fair Value, Inputs, Level 2 | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 54,852,000 | 65,465,000
Fair Value, Inputs, Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common and collective trusts | International small cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common and collective trusts | Global/International equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common and collective trusts | Domestic equity – small/mid cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 3 | Common and collective trusts | International equity emerging markets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Industrials |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Consumer |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Healthcare |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Finance |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Utilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Information technology |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Common stock | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Mutual funds | Foreign large blend |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Mutual funds | Long-term bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 3 | Mutual funds | Mid-cap Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Fair Value, Inputs, Level 3 | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 3 | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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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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