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Stockholder's Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Stockholders' Equity (Textual) [Abstract] |  |  |  |
Treasury stock, shares, acquired | 35,000 | 50,000 | 35,000 | 135,000
Weighted-average purchase prices per share | $ 87.41 | $ 60.94 | $ 87.41 | $ 58.24
Total cost of treasury shares acquired | $ 3.1 | $ 3.1 | $ 3.1 | $ 7.9
Common stock remaining for repurchase | 160,000 |  | 160,000 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7 -Subparagraph b -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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