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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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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.

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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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