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Debt And Interest Expense (Convertible Debentures) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2007 | Dec. 31, 2015 | Dec. 31, 2015 | Mar. 27, 2015 | Dec. 31, 2014 | Apr. 16, 2013 | Aug. 15, 2007
Debt Disclosure [Abstract] |  |  |  |  |  |  |
Principal amount of debt |  | $ 1,250,000,000 | $ 1,250,000,000 | $ 500,000,000 | $ 1,250,000,000 | $ 750,000,000 | $ 1,250,000,000
Convertible debenture, interest rate |  |  |  | 5.25% |  | 4.625% | 3.25%
Convertible debenture, maturity date | Aug. 15, 2037 |  |  |  |  |  |
Conversion rate per 1000 principal amount | 2909.68% |  |  |  |  |  |
Denominator of principal value upon which conversion is based | $ 1,000 |  |  |  |  |  |
Conversion price |  |  |  |  |  |  | $ 34.37
stock reserved for issuance |  | 36.4 | 36.4 |  |  |  |
Minimum required sales price as a percentage of conversion price | 150.00% |  |  |  |  |  |
Debt Instrument, Convertible, Stock Price Trigger |  | $ 44.68 |  |  |  |  |
Additional common shares potentially issuable based on if-converted value of convertible debentures |  |  | 22.1 |  |  |  |
Debt issuance costs | $ 25,777,000 |  |  |  |  |  |
Discount rate | 8.50% |  | 8.50% |  |  |  |
Debt Instrument, Convertible, Remaining Discount Amortization Period |  |  | 21 years 227 days |  |  |  |
Effective interest rate |  |  |  |  |  |  | 8.39%

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