Stockholders' Deficit Stockholders' (Deficit) Equity (Summary of Common Stock Repurchase) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Treasury Stock Shares Repurchased	16,316	21,006	7,692
Treasury Stock Shares Repurchased For Tax Withholdings And Other	297	298	279
Treasury Stock, Shares, Acquired	16,613	21,304	7,971
Treasury Stock, Value, Acquired, Cost Method	$ 883,403	$ 1,035,617	$ 325,680
Treasury Stock Shares Repurchased, Average Cost Per Share	$ 53.15	$ 48.65	$ 40.90
Treasury stock shares repurchased for tax withholdings and other, average cost per share	$ 54.73	$ 46.16	$ 39.63
Treasury Stock Acquired, Average Cost Per Share	$ 53.18	$ 48.61	$ 40.86