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Share Repurchase Program and Treasury Stock (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Share Repurchase Program and Treasury Stock (Textuals) [Abstract] |  |  |
Remaining Amount to Repurchase under the program | $ 292,500,000 |  |
Stock Repurchase Program, Additional Authorized Amount | 750,000,000 |  |
Shares Purchased Under Share Repurchase Program | 20,800,000 |  |
Treasury Stock, Value, Acquired, Cost Method | $ 144,844,000 | $ 135,800,000 | $ 278,672,000
Number of shares repurchased | 680,934 | 797,095 |
Average price of share repurchased, per share | $ 212.69 | $ 170.31 |
Exercise of stock options and restricted stock units, shares reissued | 216,176 | 233,146 |

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- Definition Number of treasury shares reissued during the period as a result of the exercise of stock options and vesting of restricted stock units. + References No definition available. + Details
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- Definition Shares repurchased program-to-date by a Company's share repurchase program. + References No definition available. + Details
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- Definition The additional amount authorized by an entity's Board of Directors under a stock repurchase program. + 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 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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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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