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Debt (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) Debt / EBITDA Interest / Debt | Dec. 31, 2015 USD ($)
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 583,033 | $ 613,877
Less debt fees |  | (253) | (375)
Total long-term debt |  | 582,780 | 613,502
Aggregate amounts of contractual maturities of long-term debt for the next five years [Abstract] |  |  |
Amounts due in 2017 |  | 103,800 |
Amounts due in 2018 |  | 38,900 |
Amounts due in 2019 |  | 17,100 |
Amounts due in 2020 |  | 236,900 |
Amounts due in 2021 |  | 100 |
Stand-by letters of credit outstanding |  | 6,800 | 6,300
Short-term borrowings [Abstract] |  |  |
Short-term borrowings |  | $ 20,578 | $ 20,655
Weighted-average interest rates on short-term borrowings |  | 2.26% | 1.62%
Maximum [Member] |  |  |
Debt covenants [Abstract] |  |  |
Debt to EBITDA, actual | Debt / EBITDA | [1] | 2.51 |
Debt to adjusted EBITDA, required | Debt / EBITDA | [1] | 3.50 |
Minimum [Member] |  |  |
Debt covenants [Abstract] |  |  |
Interest coverage, actual | Interest / Debt |  | 7.35 |
Interest coverage, required | Interest / Debt |  | 2.00 |
Long-term Revolving Credit Facility [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 162,079 | $ 103,343
Credit facility, amount |  | 520,000 |
Long term debt additional disclosures [Abstract] |  |  |
Remaining borrowing capacity |  | 41,000 |
Revolving Credit Facility [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Credit facility, amount |  | $ 350,000 |
Long term debt additional disclosures [Abstract] |  |  |
Average effective interest rate |  | 1.40% | 1.36%
Remaining borrowing capacity |  | $ 256,000 |
Uncommitted Loans [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Short-term borrowings |  | 20,435 | $ 18,580
Loans of Foreign Subsidiaries [Member] |  |  |
Short-term borrowings [Abstract] |  |  |
Short-term borrowings |  | 143 | 2,075
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% |
Term loan, maturity date |  | Nov. 30, 2023 |
3.06% Euro-denominated Senior Notes due November 2023 [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 40,226 | 41,545
Interest rate, stated percentage |  | 3.06% |
Term loan, maturity date |  | Nov. 30, 2023 |
1.85% Euro-denominated Senior Notes due November 2022 [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 70,316 | 72,623
Interest rate, stated percentage |  | 1.85% |
Term loan, 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% |
Term loan, maturity date |  | Nov. 30, 2018 |
4.14% Senior Notes due November 2017 [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 25,000 | 25,000
Interest rate, stated percentage |  | 4.14% |
Term loan, maturity date |  | Nov. 30, 2017 |
4.91% Senior Notes due through May 2017 [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 66,000 | 77,000
Interest rate, stated percentage |  | 4.91% |
Term loan, maturity date |  | May 31, 2017 |
3.77% Senior Notes due November 2016 [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 0 | 25,000
Interest rate, stated percentage |  | 3.77% |
Term loan, maturity date |  | Nov. 30, 2016 |
Term Loan [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Long term debt |  | $ 118,313 | 167,875
Term loan, face amount |  | $ 170,000 |
Term Loan [Member] | Revolving Credit Facility [Member] |  |  |
Schedule of long term debt [Abstract] |  |  |
Credit facility maturity date |  | Nov. 06, 2020 |
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 |  | $ 1,099 | $ 1,491
[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 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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