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, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Note [Abstract]
Treasury Stock Shares Repurchased	7,692	16,318	15,672
Treasury Stock Shares Repurchased For Tax Withholdings And Other	279	465	470
Treasury Stock, Shares, Acquired	7,971	16,783	16,142
Treasury Stock, Value, Acquired, Cost Method	$ 325,680	$ 550,097	$ 449,749
Treasury Stock Shares Repurchased, Average Cost Per Share	$ 40.90	$ 32.76	$ 27.93
Treasury stock shares repurchased for tax withholdings and other, average cost per share	$ 39.63	$ 33.37	$ 25.63
Treasury Stock Acquired, Average Cost Per Share	$ 40.86	$ 32.78	$ 27.86