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Debt (Details)
$ in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Debt / EBITDA
Interest / Debt
Dec. 31, 2014
USD ($)
Dec. 31, 2015
EUR (€)
Debt / EBITDA
Interest / Debt
Schedule of long term debt [Abstract]      
Long-term debt, gross $ 613,877 $ 451,011  
Less current maturities 0 0  
Total long-term debt 613,877 451,011  
Aggregate amounts of contractual maturities of long-term debt for the next five years [Abstract]      
Amounts due in 2016 45,900    
Amounts due in 2017 103,900    
Amounts due in 2018 38,900    
Amounts due in 2019 17,100    
Amounts due in 2020 $ 218,200    
Debt covenants [Abstract]      
Debt to EBITDA (Maximum), Actual | Debt / EBITDA [1] 2.49   2.49
Interest Coverage (Minimum), Actual | Interest / Debt 7.60   7.60
Debt to Adjusted EBITDA (Maximum), Required | Debt / EBITDA [1] 3.50   3.50
Interest Coverage (Minimum), Required | Interest / Debt 2.00   2.00
Stand-by letters of credit outstanding $ 6,300 6,300  
Short-term borrowings [Abstract]      
Short-term borrowings $ 20,655 $ 15,888  
Weighted-average interest rates on short-term borrowings 1.62% 1.66% 1.62%
Uncommitted Loans [Member]      
Short-term borrowings [Abstract]      
Short-term borrowings $ 18,580 $ 14,086  
Loans of Foreign Subsidiaries [Member]      
Short-term borrowings [Abstract]      
Short-term borrowings 2,075 1,802  
3.66% Senior Notes due November 2023 [Member]      
Schedule of long term debt [Abstract]      
Long-term debt, gross $ 75,000 75,000  
Interest rate, stated percentage 3.66%   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, gross $ 41,545 46,270  
Interest rate, stated percentage 3.06%   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, gross $ 72,623 0  
Interest rate, stated percentage 1.85%   1.85%
Term loan, maturity date Nov. 30, 2022    
Term loan, face amount | €     € 67
Tenure of fixed-rate notes 7 years    
4.47% Senior Notes due November 2018 [Member]      
Schedule of long term debt [Abstract]      
Long-term debt, gross $ 25,000 25,000  
Interest rate, stated percentage 4.47%   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, gross $ 25,000 25,000  
Interest rate, stated percentage 4.14%   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, gross $ 77,000 88,000  
Interest rate, stated percentage 4.91%   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, gross $ 25,000 25,000  
Interest rate, stated percentage 3.77%   3.77%
Term loan, maturity date Nov. 30, 2016    
Term Loan [Member]      
Schedule of long term debt [Abstract]      
Long-term debt, gross $ 167,875 98,750  
Term loan, face amount $ 170,000 100,000  
Credit facility maturity date Nov. 06, 2020    
Term Loan [Member] | LIBOR [Member]      
Schedule of long term debt [Abstract]      
Interest rate 1.50%    
Long-term Revolving Loan Agreement [Member]      
Schedule of long term debt [Abstract]      
Long-term debt, gross $ 103,343 65,987  
Credit facility, amount   $ 450,000  
Long term debt additional disclosures [Abstract]      
Average effective interest rate 1.36% 1.54%  
Remaining borrowing capacity $ 86,300    
Various Other Notes [Member]      
Schedule of long term debt [Abstract]      
Long-term debt, gross 1,491 $ 2,004  
Revolving Credit Facility [Member]      
Schedule of long term debt [Abstract]      
Credit facility, amount 350,000    
Long term debt additional disclosures [Abstract]      
Remaining borrowing capacity $ 255,300    
[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.