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Debt (Details) $ in Thousands, € in Millions			12 Months Ended
		May 03, 2017 USD ($) Note	Dec. 31, 2017 USD ($) Debt / EBITDA Interest / Debt	Dec. 31, 2016 USD ($)	May 03, 2017 EUR (€)
Schedule of long term debt [Abstract]
Long term debt			$ 604,372	$ 583,033
Less debt fees			(213)	(253)
Total long-term debt			604,159	582,780
Number of fixed-rate notes | Note		3
Aggregate amounts of contractual maturities of long-term debt for the next five years [Abstract]
Amounts due in 2018			34,100
Amounts due in 2019			11,000
Amounts due in 2020			12,800
Amounts due in 2021			14,600
Amounts due in 2022			275,400
Stand-by letters of credit outstanding			5,900	6,800
Short-term borrowings [Abstract]
Short-term borrowings			$ 20,130	$ 20,578
Weighted-average interest rates on short-term borrowings			2.46%	2.26%
Maximum [Member]
Debt covenants [Abstract]
Debt to EBITDA, actual | Debt / EBITDA	[1]		2.61
Debt to EBITDA, required | Debt / EBITDA	[1]		3.50
Minimum [Member]
Debt covenants [Abstract]
Interest coverage, actual | Interest / Debt			7.23
Interest coverage, required | Interest / Debt			2.00
Long-term Revolving Credit Facility [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 100,712	$ 162,079
Long term debt additional disclosures [Abstract]
Remaining borrowing capacity			$ 66,800
Revolving Credit Facility [Member]
Schedule of long term debt [Abstract]
Credit facility, amount		$ 350,000
Credit facility maturity date			May 03, 2022
Long term debt additional disclosures [Abstract]
Average effective interest rate			1.77%	1.40%
Remaining borrowing capacity			$ 296,400
Uncommitted Loans [Member]
Short-term borrowings [Abstract]
Short-term borrowings			19,192	$ 20,435
Loans of Foreign Subsidiaries [Member]
Short-term borrowings [Abstract]
Short-term borrowings			938	143
3.66% Senior Notes due November 2023 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 75,000	75,000
Interest rate, stated percentage			3.66%
Maturity date			Nov. 30, 2023
3.65% Senior Notes due May 2024 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 27,000	0
Interest rate, stated percentage			3.65%
Maturity date			May 31, 2024
Debt instrument term			7 years
Debt instrument amount | €					€ 27
1.27% Euro-denominated Senior Notes due May 2024 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 60,024	0
Interest rate, stated percentage			1.27%
Maturity date			May 31, 2024
Debt instrument term			7 years
Debt instrument amount | €					50
1.71% Euro-denominated Senior Notes due May 2027 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 48,019	0
Interest rate, stated percentage			1.71%
Maturity date			May 31, 2027
Debt instrument term			10 years
Debt instrument amount | €					€ 40
3.06% Euro-denominated Senior Notes due November 2023 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 45,914	40,226
Interest rate, stated percentage			3.06%
Maturity date			Nov. 30, 2023
1.85% Euro-denominated Senior Notes due November 2022 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 80,260	70,316
Interest rate, stated percentage			1.85%
Maturity date			Nov. 30, 2022
4.47% Senior Notes due November 2018 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 25,000	25,000
Interest rate, stated percentage			4.47%
Maturity date			Nov. 30, 2018
4.14% Senior Notes due November 2017 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 0	25,000
Interest rate, stated percentage			4.14%
Maturity date			Nov. 30, 2017
4.91% Senior Notes due through May 2017 [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 0	66,000
Interest rate, stated percentage			4.91%
Maturity date			May 31, 2017
Term Loan [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 141,375	118,313
Credit facility, amount		$ 145,000
Credit facility maturity date			May 03, 2022
Term Loan [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Schedule of long term debt [Abstract]
Interest rate			1.50%
Various Other Notes [Member]
Schedule of long term debt [Abstract]
Long term debt			$ 1,068	$ 1,099
[1] Debt to EBITDA is defined in the Company's debt covenants as total funded debt divided by the Company's consolidated operating income excluding non-operating gains and losses and depreciation and amortization.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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