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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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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