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Stockholders' Deficit Stockholders' (Deficit) Equity (Summary of Common Stock Repurchase) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Feb. 07, 2019 | Feb. 08, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 1,000,000 | $ 1,000,000 |  |  |
Additional share repurchase amount authorized | $ 602,900 | $ 585,800 |  |  |
Treasury Stock Shares Repurchased |  |  | 4,352 | 6,265 | 7,789
Treasury Stock Shares Repurchased For Tax Withholdings And Other |  |  | 309 | 335 | 320
Treasury Stock, Shares, Acquired |  |  | 4,661 | 6,600 | 8,109
Treasury Stock Shares Repurchased, Average Cost Per Share |  |  | $ 137.86 | $ 94.59 | $ 81.73
Treasury stock shares repurchased for tax withholdings and other, average cost per share |  |  | 123.62 | 85.27 | 80.74
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 136.91 | $ 94.12 | $ 81.70
Payments for Repurchase of Common Stock |  |  | $ 638,152 | $ 621,173 | $ 662,491

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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