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Debt And Credit Arrangements - 2018 Notes (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 06, 2017 USD ($) | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Aug. 03, 2011 USD ($) $ / shares shares
Debt Instrument |  |  |  |  |
Amortization of Debt Issuance Costs |  | $ 300,000 | $ 300,000 |  |
Convertible Notes, Due 2018 | Convertible Debt |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  | 2.00%
Debt instrument face amount |  | $ 57,100,000.0 |  | $ 57,100,000 | $ 250,000,000.0
Debt instrument effective interest rate |  | 7.90% |  |  | 7.90%
Repayment of debt | $ 195,900,000 |  |  |  |
Debt repurchased | 192,900,000 |  |  |  |
Accrued interest on debt instrument | 1,000,000 |  |  |  |
Debt extinguished | $ 194,900,000 |  |  |  |
Discount rate | 4.80% |  |  |  |
Convertible debt | $ 184,700,000 | $ 55,900,000 |  | $ 55,100,000 |
Loss on extinguishment of debt | 4,300,000 |  |  |  |
Interest paid | 1,000,000 |  |  |  |
Share conversion rate per 1,000 principal | shares |  | 14.4865 |  |  |
Debt instrument, conversion price (usd per share) | $ / shares |  | $ 69.03 |  |  |
Debt instrument, threshold for consecutive trading days |  | 20 |  |  |
Debt instrument, threshold for trading days |  | 30 |  |  |
Applicable conversion price threshold (as percentage) |  | 130.00% |  |  |
Applicable conversion price, less than (as percentage) |  | 97.00% |  |  |
Maximum days after five trading days |  | 5 days |  |  |
Warrant exercise price (usd per share) | $ / shares |  |  |  |  | $ 84.96
Number of shares underlying warrants | shares |  |  |  |  | 800,000
Amortization of Debt Issuance Costs |  | $ 0 | $ 200,000 |  |
Convertible Notes, Due 2018 | Convertible Debt | Liability Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument face amount |  | 170,900,000 |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Equity Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument face amount |  | $ 79,100,000 |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Liability Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt extinguished | 189,000,000 |  |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Equity Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt extinguished | $ 5,800,000 |  |  |  |

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