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Debt And Credit Arrangements Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term debt | $ 6,160 | $ 4,903
Debt, Long-term and Short-term, Combined Amount | 221,794 | 209,002
Current Maturities Of Long Term Debt Including Short Term Debt | 6,160 | 4,903
Long-term Debt, Excluding Current Maturities | 215,634 | 204,099
Foreign Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term debt | 6,160 | 4,903
Convertible Debt [Member] | Convertible Notes, Due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 215,634 | $ 204,099

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