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Debt Schedule of Convertible Debt (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Jun. 30, 2014
3.75% Convertible Senior Subordinated Notes, due 2025 [Member]
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Sep. 30, 2013
3.75% Convertible Senior Subordinated Notes, due 2025 [Member]
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Sep. 30, 2014
3.75% Convertible Senior Subordinated Notes, due 2025 [Member]
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Sep. 30, 2014
4.00% Junior Subordinated Convertible Debentures, due 2033 [Member]
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Sep. 30, 2014
3.25% Convertible Senior Debentures, Due 2035 [Member]
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Sep. 30, 2014
3.75% Convertible Senior Subordinated Notes Due 2042 [Member]
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Sep. 30, 2014
3.5% Convertible senior subordinated debt [Domain]
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| Debt Instrument [Line Items] | |||||||||||
| Aggregate Principal of Convertible Debt, if Converted | $ 777,000,000 | $ 777,000,000 | |||||||||
| Extinguishment of Debt, Amount | 5,000,000 | ||||||||||
| Debt Related Costs | 72,000 | 50,868,000 | 7,832,000 | 50,868,000 | 8,000,000 | ||||||
| Debt Instrument, Convertible, Carrying Amount of Equity Component | $ 6,913,000 | $ 118,348,000 | $ 245,433,000 | $ 167,941,000 | $ 208,200,000 | ||||||
| Remaining amortization period for the debt discount (in years) | 11 years 91 days | 18 years 274 days | 1 year 91 days | 27 years 183 days | 29 years 146 days | ||||||
| Debt Instrument, Interest Rate, Effective Percentage | 8.25% | 8.01% | 7.63% | 7.30% | 7.70% | ||||||