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Earnings Per Common Share And Share Awards (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
Incremental dilutive potential common shares, calculated using treasury stock method (in shares) | 4,310 | 3,826 | 4,923 | 5,238
Anti-dilutive shares excluded from computation of diluted earnings per share | 7,500 | 3,000 | 4,500 | 0
SARs and options vesting period |  |  | 1 year |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 4,500 | 4,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] |  |  | $ 31.16 | $ 28.98
Compensation expense relating to SARs or options vesting |  |  | $ 103,000 | $ 88,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 70,000 |  | $ 70,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 5 months |
Number of stock options or SARs granted where exercise price was less than market price on date of grant |  |  | 0 | 0
Minimum |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
SARs and options expiration period |  |  | 5 years |
Annual rate at which stock appreciation rights and options are exercisable and vest |  |  | 10.00% |
Maximum |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
Maximum shares of Company stock to be granted to key employees or directors |  |  | 500,000 |
SARs and options expiration period |  |  | 10 years |
Annual rate at which stock appreciation rights and options are exercisable and vest |  |  | 20.00% |

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- Definition Number of stock options or SARs granted where exercise price was less than market price on date of grant. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award, percentage of exercisable and vesting period + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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