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Debt (4.0% Convertible Senior Notes Due 2014) (Narrative) (Details) (USD $)	9 Months Ended		0 Months Ended		3 Months Ended	9 Months Ended		0 Months Ended		3 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 01, 2014 4.0% Convertible Senior Notes [Member]	Apr. 29, 2009 4.0% Convertible Senior Notes [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member]	Oct. 01, 2014 4.0% Convertible Senior Notes [Member]	Oct. 01, 2014 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Apr. 24, 2009 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Jun. 30, 2014 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Sep. 30, 2014 Circumstance A [Member] 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Sep. 30, 2014 Circumstance B [Member] 4.0% Convertible Senior Notes [Member] Class A Common Stock [Member]	Sep. 30, 2014 Subsequent Event [Member] 4.0% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date				Apr. 24, 2009
Convertible senior notes issued				$ 500,000,000
Debt instrument, interest rate, stated percentage				4.00%	4.00%	4.00%
Interest payable dates				April 1 and October 1
Debt instrument, maturity date				Oct. 01, 2014		Oct. 01, 2014
Conversion rate									0.0329164
Per share conversion price									$ 30.38
Conversion premium									22.50%
Last reported selling price									$ 24.80
Upper strike price of warrants									$ 44.64
Principal amount converted			367,000,000		11,300,000	132,900,000									74,300,000
Issuance of common stock								8,700,000		300,000		3,000,000
Common stock received from conversion settlement										400,000	100,000	3,000,000
Company paid in cash to settle warrants	602,834,000	42,424,000			326,600,000
Settlement of outstanding warrants, percentage					32.00%	62.00%									7.00%
Number of warrants remaining under obligation															5,100,000
Number of warrants remaining under obligation, percentage															31.00%
Issuance of stock for conversion of debt, amount	284,000	18,158,000
Payments for settlement of convertible debt	132,592,000	794,997,000	367,000,000
Aggregate principal amount of convertible debt							$ 38,000,000
Settlement of outstanding warrants													5,300,000	10,200,000	1,200,000

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