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Debt and Credit Arrangements - 2018 Notes (Details) $ / shares in Units, shares in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 06, 2017 USD ($) | Aug. 03, 2011 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument |  |  |  |
Document Fiscal Year Focus |  |  | 2018 |
Convertible Notes, Due 2018 | Convertible Debt |  |  |  |
Debt Instrument |  |  |  |
Debt instrument stated interest rate |  | 2.00% |  |
Debt instrument face amount |  | $ 250,000,000.0 | $ 57,100,000.0 | $ 57,100,000
Debt instrument effective interest rate |  | 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 |  | $ 56,700,000 | $ 55,100,000
Loss on extinguishment of debt | 4,300,000 |  |  |
Interest paid | 1,000,000 |  |  |
Share conversion rate per 1,000 principal |  | 0.0144865 |  |
Debt instrument, conversion price (usd per share) | $ / shares |  | $ 69.03 |  |
Warrant exercise price (usd per share) | $ / shares |  | $ 84.96 |  |
Number of shares underlying warrants | shares |  | 770 |  |
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 |  |  |
Revolving Credit Facility | Senior secured revolving credit facility due November 2022 |  |  |  |
Debt Instrument |  |  |  |
Debt instrument stated interest rate |  |  | 4.25% |

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