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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
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