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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Nov. 06, 2017 | Aug. 03, 2011
--- | --- | --- | --- | ---
Debt Instrument |  |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 510,700,000 | $ 498,100,000 |  |
Less: current maturities | (66,800,000) | (58,900,000) |  |
Long-term debt | 443,900,000 | 439,200,000 |  |
Foreign facilities |  |  |  |
Debt Instrument |  |  |  |
Long term debt | 10,100,000 | 7,900,000 |  |
Revolving Credit Facility |  |  |  |
Debt Instrument |  |  |  |
Long term debt | 244,000,000 | 239,000,000 |  |
Revolving Credit Facility | Senior secured revolving credit facility due November 2022 |  |  |  |
Debt Instrument |  |  |  |
Unamortized debt issuance costs | (2,200,000) |  |  |
Long term debt | 238,000,000 |  |  |
Convertible Debt | Convertible Notes, due 2024 |  |  |  |
Debt Instrument |  |  |  |
Principal amount | 258,800,000 | 258,800,000 | $ 258,800,000.0 |
Unamortized discount | (54,100,000) | (57,600,000) |  |
Unamortized debt issuance costs | (4,800,000) | (5,100,000) |  |
Convertible Debt | 199,900,000 | 196,100,000 |  |
Convertible Debt | Convertible Notes, Due 2018 |  |  |  |
Debt Instrument |  |  |  |
Principal amount | 57,100,000.0 | 57,100,000 |  | $ 250,000,000.0
Unamortized discount | (400,000) | (1,900,000) |  |
Unamortized debt issuance costs | 0 | (100,000) |  |
Convertible Debt | 56,700,000 | $ 55,100,000 | $ 184,700,000 |
Convertible debt, current | $ 56,700,000 |  |  |

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