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Stock Repurchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended | 0 Months Ended | 12 Months Ended
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Oct. 17, 2007 | Jun. 30, 2011 | Dec. 14, 2011 Stock Repurchase Program Additional Authorization [Member] | Feb. 22, 2011 Stock Repurchase Program Additional Authorization [Member] | Dec. 31, 2011 Stock Repurchase Program Additional Authorization [Member] | Dec. 31, 2011 Treasury Stock [Member]
Stock Repurchase Program [Line Items] |  |  |  |  |  |
Common stock repurchase authorized amount | $ 150.0 |  | $ 150.0 | $ 100.0 |  |
Total stock repurchased, shares |  | 863,466 |  |  | 3,960,555 | 2,355
Total stock repurchased, value |  |  |  |  | 99 |
Common stock repurchase price per share |  | $ 27.94 |  |  | $ 24.99 |
Treasury stock repurchase authorization amount available |  |  |  |  | $ 1 |

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- Details
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- Definition Number of shares that have been repurchased under the stock repurchase program. + References No definition available. + Details
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- Definition Total Stock Repurchased, Value + References No definition available. + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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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 AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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