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Stock Options and Restricted Stock (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Apr. 30, 2011 1996 Equity Compensation Plan [Member] | Apr. 30, 2011 2011 Equity Compensation Plan [Member] | Apr. 30, 2012 Restricted Stock [Member] | Feb. 29, 2012 Restricted Stock [Member] | Feb. 29, 2012 Minimum [Member] Restricted Stock [Member] | Feb. 29, 2012 Maximum [Member] Restricted Stock [Member]
Stock Options and Restricted Stock (Textual) |  |  |  |  |  |  |
Shares approved for grants |  |  |  | 10,728 | 72,013 |  |
Shares available for grant |  | 350,000 | 300,000 |  |  |  |
Vesting period, years |  |  |  | 3 years |  | 5 years | 7 years
Closing price of stock on date of stock grant |  |  |  | $ 83.88 | $ 115.55 |  |
Maximum term of the awards granted under the Plan | 10 years |  |  |  |  |  |
Stock-based compensation cost which has not yet been recognized | $ 35.8 |  |  |  |  |  |
Stock-based compensation cost recognized period, in months | 62 months |  |  |  |  |  |
Restricted stock awarded subject to performance condition | 230,000 |  |  |  |  |  |
Number of shares not meeting performance criteria | 45,920 |  |  |  |  |  |
Reduction in stock based compensation | $ 7.0 |  |  |  |  |  |

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- Definition Amount of restricted stock shares for which certain performance criteria more than likely would not be achieved. + References No definition available. + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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