Debt and Commitments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Fair Value	$ 509,283us-gaap_DebtInstrumentFairValue	$ 563,886us-gaap_DebtInstrumentFairValue
Borrowings under lines of credit and overdrafts	8,028us-gaap_ShortTermBorrowings	1,074us-gaap_ShortTermBorrowings
Total debt, net of unamortized discounts	504,734b_TotalDebtNetOfUnamortizedDiscounts	547,424b_TotalDebtNetOfUnamortizedDiscounts
Less current maturities	(8,890)us-gaap_DebtCurrent	(57,083)us-gaap_DebtCurrent
Long-term debt	495,844us-gaap_LongTermDebtNoncurrent	490,341us-gaap_LongTermDebtNoncurrent
Convertible Debt [Member] \| 3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	0	55,636
Fair Value	0	76,569
Unamortized debt discount	0	(731)
Total debt, net of unamortized discounts	0	54,905
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Carrying Amount	393,518	487,920
Fair Value	394,917	482,431
Senior Notes [Member] \| 3.97% Senior Notes [Member]
Debt Instrument [Line Items]
Carrying Amount	100,000	0
Fair Value	102,859	0
Borrowings Under Lines of Credit and Overdrafts [Member]
Debt Instrument [Line Items]
Fair Value	8,028	1,074
Borrowings under lines of credit and overdrafts	8,028	1,074
Foreign bank borrowings [Member]
Debt Instrument [Line Items]
Carrying Amount	0	405
Fair Value	0	410
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Carrying Amount	3,188	3,120
Fair Value	$ 3,479	$ 3,402

Total debt, net of unamortized discounts

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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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