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Capital Stock (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares shares
Capital Stock [Abstract] |
Amount of common stock Board of Directors authorized to be repurchased after previous authorizations, maximum (in thousands of dollars) | $ 500,000
Number of shares repurchased (in shares) | shares | 1,584
Average price per share for the shares repurchased (in dollars per share) | $ / shares | $ 94.74
Purchases of common stock | $ (150,054)
Amount remaining under the authorization | $ 177,966

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- Definition Number of shares repurchased during the fiscal period under the cumulative stock repurchase programs authorized by the company's Board of Directors. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + 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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