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, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Treasury Stock Shares Repurchased	7,789	9,338	16,316
Treasury Stock Shares Repurchased For Tax Withholdings And Other	320	333	297
Treasury Stock, Shares, Acquired	8,109	9,671	16,613
Treasury Stock Shares Repurchased, Average Cost Per Share	$ 81.73	$ 66.59	$ 53.15
Treasury stock shares repurchased for tax withholdings and other, average cost per share	80.74	64.03	54.73
Treasury Stock Acquired, Average Cost Per Share	$ 81.70	$ 66.50	$ 53.18
Payments for Repurchase of Common Stock	$ 662,491	$ 643,169	$ 883,403