Debt and Credit Arrangements Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 234,734	$ 228,115
Short-term debt and current portion of long-term debt	6,642	6,487
Debt, Long-term and Short-term, Combined Amount	245,306	241,323
Debt, Long-term and Short-term, Combined Amount, Net of Unamortized Debt Issuance Costs	244,536	240,198
Current Maturities Of Long Term Debt Including Short Term Debt	6,642	6,487
Long-term debt	237,894	233,711
Foreign Facilities [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	10,572	13,208
Convertible Debt [Member] \| Convertible Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 770	$ 1,125

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Debt, Long-term and Short-term, Combined Amount, Net of Unamortized Debt Issuance Costs

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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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