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Retirement and Share-based Compensation Plans (Deferred Compensation Arrangements) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Compensation Plans, Certain Officers, Directors and Consultants [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Shares earned and reserved for future issuance | 364,000 | 366,072 |
Share-based compensation expense |  | $ 102,000 | $ 127,000
Deferred Compensation Plans, Officer Rabbi Trust [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Deferred compensation liability | $ 3,500,000 | $ 3,700,000 |
Shares held | 102,932 | 103,251 |
Deferred Compensation Plans, NMO Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Award vesting period | 9 years |  |
Undistributed vested shares | 0 | 223,454 |
Deferred Compensation Plans, NMO Trust [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Shares held | 15,058 | 230,012 |
Shares distributed | 215,273 | 313,108 | 349,568

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- Definition Item represents the number of shares that were distributed to participants. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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Period Type: | duration

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- Definition Item represents the number of shares held as of the end of the reporting period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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- Definition Item represents the number of shares that have vested and remain undistributed at the end of the reporting period. + References No definition available. + Details
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Period Type: | instant

X
- Definition Item represents the number of shares earned by individuals under deferred compensation plans that have been reserved for issuance at a future date. + References No definition available. + Details
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X
- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- 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

X
- 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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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Details
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- Details
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- Details
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