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Retirement and Share-based Compensation Plans (Deferred Compensation Arrangements) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Compensation Plans, Certain Officers, Directors and Consultants |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |
Shares reserved for future issuance | 364,000 | 364,000
Deferred Compensation Plans, Officer Rabbi Trust |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |
Shares reserved for future issuance | 32,597 | 34,539
Deferred compensation liability | $ 1.5 | $ 2.0

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- Definition Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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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 Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |