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Repurchases Of Common Stock (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Repurchases Of Common Stock [Abstract] |  |
Shares repurchased | 859,000 us-gaap_TreasuryStockSharesAcquired | 576,000 us-gaap_TreasuryStockSharesAcquired
Total cost of shares repurchased | $ 133,647,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 70,279,000 us-gaap_TreasuryStockValueAcquiredCostMethod
Average cost per share | $ 155.58 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 122.04 us-gaap_TreasuryStockAcquiredAverageCostPerShare
Shares acquired through employee surrenders | 30,625 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 40,537 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Cost of shares acquired through employee surrenders | $ 4,900,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | $ 5,000,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + 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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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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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