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Components of Net Periodic Benefit Cost (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year |  | $ 1,800
Defined Benefit Plan, Expected Future Benefit Payments, Next Rolling Twelve Months |  | 1,100
Defined Contribution Plan Employer Accrued Discretionary Contribution Amount | $ 719 |
Post Retirement Health Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year |  | $ 247
Defined Benefit Plan, Contributions by Employer | 110 |
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Contributions by Employer | $ 554 |

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- Definition Amount of potential discretionary contributions accrued to a defined contribution plan. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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- Details
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