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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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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