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Subsequent Events (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2011
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| Subsequent Events [Line Items] | |
| Cash dividend | $ 0.72 |
| Dividends payable date | Mar. 19, 2012 |
| Dividends record date | Mar. 09, 2012 |
| Options granted in period | 945,517 |
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Stock Options [Member]
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| Subsequent Events [Line Items] | |
| Options granted in period | 860,000 |
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Restricted Stock [Member]
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| Subsequent Events [Line Items] | |
| Restricted stock and RSU's granted in period | 5,500 |
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Performance-Based [Member] | Restricted Stock Units (RSUs) [Member]
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| Subsequent Events [Line Items] | |
| Restricted stock and RSU's granted in period | 200,000 |
| X | ||||||||||
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- Definition
The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The per share amount of a dividend declared, but not paid, as of the financial reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date. No definition available.
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| X | ||||||||||
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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