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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
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