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Shareholders' Equity (Share Repurchases, Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 30, 2010 Shares Repurchase, Settlement of Tax Liabilities Related to the Exercise of Stock Options | Dec. 31, 2012 Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options | Dec. 31, 2011 Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options | Dec. 31, 2010 Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options | Apr. 30, 2012 Share Repurchase Program Authorized in 2010 | Jan. 31, 2011 Share Repurchase Program Authorized in 2010 | May 31, 2010 Share Repurchase Program Authorized in 2010 | Jan. 31, 2013 Share Repurchase Program Authorized in 2010 Repurchase of Equity
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of common shares, shares |  |  |  | 163,022 | 1,268,809 | 743,073 | 452,433 |  |  |  |
Repurchase of common shares, value | $ 8,086,594 | $ 4,247,440 | $ 4,887,247 | $ 1,900,000 | $ 8,100,000 | $ 4,200,000 | $ 3,000,000 |  |  |  |
Share repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  |  |  |  | 10,000,000 |
Share repurchase program, additional authorized amount replacing prior authorizations |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  | $ 10,000,000

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: 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 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: 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 + Details
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