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Stock Based Compensation (Schedule of Activity and Changes Under the Principal Option Plan ) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding Begininng Balance- shares | 183,574 | 171,378 | 198,946
Granted Stock Option Plan - Shares | 41,639 | 27,784 | 27,784
Exercised Stock Option Plan - Shares | 2,268 | (15,588) | (42,495)
Expired or Cancelled Stock Option Plan - Shares | (34,565) | 0 | (12,857)
Outstaning Ending Balance- shares | 188,380 | 183,574 | 171,378
Granted Stock Option Plan - Exercise Price Range per Share |  | $ 9.64 | $ 9.11
Exercised Stock Option Plan - Exercise Price Range per Share |  |  | $ 7.71
Expired or Cancelled Stock Option Plan - Exercise Price Range per Share |  | $ 0.00 |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding Begininng Balance- shares |  | 15.73 |
Outstaning Ending Balance- shares |  |  | 15.73
Outstanding Beginning Balance- Exercise Price Range per Share | $ 15.73 |  | $ 15.73
Granted Stock Option Plan - Exercise Price Range per Share | $ 14.24 |  |
Exercised Stock Option Plan - Exercise Price Range per Share | $ 10.66 | $ 10.50 |
Expired or Cancelled Stock Option Plan - Exercise Price Range per Share | $ 15.73 |  | $ 15.73
Outstanding Ending Balance- Exercise Price Range per Share | $ 15.73 | $ 15.73 |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding Begininng Balance- shares |  | 7.67 |
Outstaning Ending Balance- shares |  |  | 7.67
Outstanding Beginning Balance- Exercise Price Range per Share | $ 7.67 |  | $ 7.67
Granted Stock Option Plan - Exercise Price Range per Share | $ 12.52 |  |
Exercised Stock Option Plan - Exercise Price Range per Share | $ 7.67 | $ 7.67 |
Expired or Cancelled Stock Option Plan - Exercise Price Range per Share | $ 7.67 |  | $ 10.50
Outstanding Ending Balance- Exercise Price Range per Share | $ 7.67 | $ 7.67 |

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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all exercised stock options which are in the customized range of exercise prices. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all expired or cancelled stock options which are in the customized range of exercise prices. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all granted stock options which are in the customized range of exercise prices. + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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