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Retirement Plans, Schedule of Employer Contribution (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | $ 0 | $ 8,400
SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | 152 | 143
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | $ 70 | $ 84

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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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Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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- Details
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Data Type: | na
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- Details
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