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Debt and Credit Arrangements Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 231,392 | $ 228,115
Short-term debt and current portion of long-term debt | 5,073 | 6,487
Debt, Long-term and Short-term, Combined Amount | 243,223 | 241,323
Current Maturities Of Long Term Debt Including Short Term Debt | 5,073 | 6,487
Long-term debt | 237,202 | 233,711
Foreign Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term debt and current portion of long-term debt | 11,831 | 13,208
Convertible Debt [Member] | Convertible Notes, Due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense | $ 948 | $ 1,125

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