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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
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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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