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v3.6.0.2

Retirement Plans, Schedule of Employer Contribution (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | $ 0 | $ 0
SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | 153 | 152
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected employer contributions | $ 50 | $ 70

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
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- Details
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