Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended															12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2008	Dec. 31, 2013 Performance Stock Units Subject To Performance Condition, Condition Two	Dec. 31, 2013 Performance Stock Units Subject To Performance Condition, Condition Three	Dec. 31, 2012 Price Vesting Units Pvu Subject to Market Condition	Dec. 31, 2013 Performance Stock Units P S U	Dec. 31, 2013 Stock Option	Dec. 31, 2012 Stock Option	Dec. 31, 2011 Stock Option	Dec. 31, 2013 Stock Option Maximum	Dec. 31, 2013 Stock Appreciation Rights (SARs)	Dec. 31, 2013 Restricted Stock Units RSU and Performance Stock Units PSU	Dec. 31, 2012 Restricted Stock Units RSU and Performance Stock Units PSU	Dec. 31, 2011 Restricted Stock Units RSU and Performance Stock Units PSU	Dec. 31, 2013 Restricted Stock Units RSU and Performance Stock Units PSU Maximum	Dec. 31, 2013 Prior Plans	Dec. 31, 2013 Omnibus Plan	Dec. 31, 2013 Omnibus Plan Performance Stock Units [Member]	Feb. 28, 2013 Omnibus Plan Performance Stock Units [Member]	Dec. 31, 2012 Omnibus Plan Performance Stock Units [Member]	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition One	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition One Maximum	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition One Minimum	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Two	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Two Maximum	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Two Minimum	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Three	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Three Maximum	Dec. 31, 2013 Omnibus Plan Performance Stock Units Subject To Performance Condition, Condition Three Minimum	Dec. 31, 2013 Omnibus Plan Restricted Stock Units	Dec. 31, 2012 Omnibus Plan Restricted Stock Units	Dec. 31, 2013 Employee Stock employee	Dec. 31, 2012 Employee Stock	Dec. 31, 2011 Employee Stock	Dec. 31, 2013 Employee Stock Maximum	Dec. 31, 2013 Employee Stock Minimum	Dec. 31, 2013 Three Year Vesting Period Omnibus Plan Restricted Stock Units	Dec. 31, 2013 Common Stock Omnibus Plan	Dec. 31, 2013 Treasury Stock Omnibus Plan
Stock-Based Compensation
Award Vesting, Percentage after Year Three							50.00%
Award Vesting, Percentage after Year Four							50.00%
Number of shares authorized, reserved for issuance				32,700,000																														8,000,000
Shares of common stock underlying awards outstanding	14,200,000																	6,000,000	8,200,000
Number of shares available for grant	19,900,000																																							16,000,000	3,900,000
Granted (Shares)																				1,700,000			1,100,000			500,000			100,000			300,000							200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Percent of Original Award																								150.00%	0.00%		100.00%	0.00%		100.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value														$ 23.95	$ 13.78	$ 14.78																$ 23.95
Weighted Average Outstanding																				$ 15.68	$ 19.95	$ 12.18										$ 17.00	$ 12.62
Unrecognized compensation cost related to non-vested stock options, RSUs and PSUs granted	$ 29,900,000
Period for recognition of total unrecognized compensation cost	1 year 4 months 26 days
Award exercise price not less than fair market value of shares of common stock													1
Expected term (years)										3 years	6 years 3 months	10 years
Expected volatility rate top percentage of index universe in US Large Capitalization									70.00%
Period fo expected volatility rate daily historical closing values of index used									6 years 3 months
Expected dividend yield										0.00%	0.00%
Number of common stock shares for each unit granted	1
Award vesting period					3 years	3 years		2 years									3 years
Award vesting percentage in first year																25.00%
Award vesting in second year																25.00%
Award vesting in third year																50.00%
Shares per emplolyee, aggregate fair market value																																					25,000
Purchase price of common stock percent																																						85.00%
Compensation expense	$ 36,100,000	$ 30,300,000	$ 31,000,000																															$ 900,000	$ 800,000	$ 700,000
Number of employees who participate in the plan																																		2,100