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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. 11, 2021 | Feb. 06, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders' Equity Note [Abstract] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 1,000,000 | $ 1,000,000 |  |  |
Additional share repurchase amount authorized | $ 747,000 | $ 743,000 |  |  |
Treasury Stock Shares Repurchased |  |  | 3,674 | 3,911 | 4,352
Treasury Stock Shares Repurchased For Tax Withholdings And Other |  |  | 204 | 243 | 309
Treasury Stock, Shares, Acquired |  |  | 3,878 | 4,154 | 4,661
Treasury Stock Shares Repurchased, Average Cost Per Share |  |  | $ 200.06 | $ 188.84 | $ 137.86
Treasury stock shares repurchased for tax withholdings and other, average cost per share |  |  | 208.92 | 181.07 | 123.62
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 200.48 | $ 188.39 | $ 136.91
Payments for Repurchase of Common Stock |  |  | $ 777,454 | $ 782,583 | $ 638,152

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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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