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Debt and Credit Arrangements Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-term debt and current portion of long-term debt | $ 244,330 |  | $ 6,487
Debt, Long-term and Short-term, Combined Amount | 548,934 |  | 241,323
Debt, Long-term and Short-term, Combined Amount, Net of Unamortized Debt Issuance Costs | 548,342 |  | 240,198
Current Maturities Of Long Term Debt Including Short Term Debt | 244,330 | [1] | 6,487
Long-term debt | 304,012 |  | 233,711
Foreign Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt and current portion of long-term debt | 10,792 |  | 13,208
Convertible Debt [Member] | Convertible Notes, Due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  |  | 228,115
Unamortized Debt Issuance Expense | (592) |  | (1,125)
Current Maturities Of Long Term Debt Including Short Term Debt | 238,142 |  |
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 300,000 |  | $ 0
Unamortized Debt Issuance Expense | $ (2,869) |  |
[1] | Current maturities includes $238,142 current convertible notes at September 30, 2017.

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