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Stockholders' Deficit Stockholders' (Deficit) Equity (Summary of Common Stock Repurchase) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |
Treasury Stock Shares Repurchased | 6,265 | 7,789 | 9,338
Treasury Stock Shares Repurchased For Tax Withholdings And Other | 335 | 320 | 333
Treasury Stock, Shares, Acquired | 6,600 | 8,109 | 9,671
Treasury Stock Shares Repurchased, Average Cost Per Share | $ 94.59 | $ 81.73 | $ 66.59
Treasury stock shares repurchased for tax withholdings and other, average cost per share | 85.27 | 80.74 | 64.03
Treasury Stock Acquired, Average Cost Per Share | $ 94.12 | $ 81.70 | $ 66.50
Payments for Repurchase of Common Stock | $ 621,173 | $ 662,491 | $ 643,169

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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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