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Debt And Interest Expense (Convertible Debentures) (Narrative) (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2007 USD ($) Rate | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) Rate shares | Dec. 31, 2015 USD ($) | Mar. 27, 2015 USD ($) Rate | Apr. 16, 2013 USD ($) Rate | Aug. 15, 2007 USD ($) $ / shares Rate
Debt Disclosure [Abstract] |  |  |  |  |  |  |
Principal amount of debt | $ |  | $ 1,250,000,000 | $ 1,250,000,000 | $ 1,250,000,000 | $ 500,000,000 | $ 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 | 29.0968 |  |  |  |  |  |
Denominator of principal value upon which conversion is based | $ | $ 1,000 |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  | $ 34.37
stock reserved for issuance | shares |  | 36.4 | 36.4 |  |  |  |
Minimum required sales price as a percentage of conversion price | 150.00% |  |  |  |  |  |
Debt Instrument, Convertible, Stock Price Trigger | $ / shares |  | $ 44.68 |  |  |  |  |
Additional common shares potentially issuable based on if-converted value of convertible debentures | shares |  |  | 19.9 |  |  |  |
Debt issuance costs | $ | $ 25,777,000 |  |  |  |  |  |
Discount rate | 8.50% |  | 8.50% |  |  |  |
Debt Instrument, Convertible, Remaining Discount Amortization Period |  |  | 20 years 227 days |  |  |  |
Effective interest rate |  |  |  |  |  |  | 8.39%

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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