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Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 2 Months Ended | 12 Months Ended | 86 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 | Sep. 01, 2017 | May 10, 2017 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2018
Share Repurchase Program |  |  |  |  |  |  |
Increase in authorized amount |  | $ 1,000,000 | $ 1,000,000 |  |  |  |
Authorization effective period |  | 3 years | 3 years |  |  |  |
Remaining balance under share repurchase program |  |  |  |  | $ 715,400 |  |
Common stock repurchased, shares |  |  |  |  | 9,301 | 5,698 |
Common stock repurchased, average price per share |  |  |  |  | $ 233.57 | $ 264.21 |
Common stock repurchased, value |  |  |  |  | $ 2,172,437 | $ 1,505,371 |
Subsequent event [Member] |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Increase in authorized amount | $ 1,000,000 |  |  |  |  |  |
Cumulative authorized amount | $ 10,800,000 |  |  |  |  |  |
Authorization effective period | 3 years |  |  |  |  |  |
Common stock repurchased, shares |  |  |  | 1,100 |  |  | 67,400
Common stock repurchased, average price per share |  |  |  | $ 255.48 |  |  | $ 138.38
Common stock repurchased, value |  |  |  | $ 289,900 |  |  | $ 9,300,000

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: 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=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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