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. 06, 2020	Feb. 07, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$ 1,000,000	$ 1,000,000
Additional share repurchase amount authorized	$ 743,000	$ 602,900
Treasury Stock Shares Repurchased			3,911	4,352	6,265
Treasury Stock Shares Repurchased For Tax Withholdings And Other			243	309	335
Treasury Stock, Shares, Acquired			4,154	4,661	6,600
Treasury Stock Shares Repurchased, Average Cost Per Share			$ 188.84	$ 137.86	$ 94.59
Treasury stock shares repurchased for tax withholdings and other, average cost per share			181.07	123.62	85.27
Treasury Stock Acquired, Average Cost Per Share			$ 188.39	$ 136.91	$ 94.12
Payments for Repurchase of Common Stock			$ 782,583	$ 638,152	$ 621,173