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Debt (Details)
€ in Thousands, £ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
GBP (£)
Jul. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Debt / EBITDA
Interest / Debt
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
GBP (£)
Debt / EBITDA
Interest / Debt
Sep. 30, 2018
USD ($)
Schedule of long term debt [Abstract]              
Long term debt     $ 689,782 $ 604,372      
Less debt fees     (229) (213)      
Total long-term debt     689,553 604,159      
Accounts receivable securitization program commitment amount     70,000       $ 60,000
Maximum borrowing capacity, secured loan     70,000       60,000
Credit facility, borrowings outstanding     70,000       $ 60,000
Proceeds from additional borrowings     322,529 231,174 $ 222,562    
Aggregate amounts of contractual maturities of long-term debt for the next five years [Abstract]              
Amounts due in 2019     11,000        
Amounts due in 2020     12,800        
Amounts due in 2021     14,600        
Amounts due in 2022     313,100        
Amounts due in 2023     150,900        
Stand-by letters of credit outstanding     6,400 5,900      
Short-term borrowings [Abstract]              
Short-term borrowings     $ 20,046 $ 20,130      
Weighted-average interest rates on short-term borrowings     3.24% 2.46%   3.24%  
Minimum [Member]              
Debt covenants [Abstract]              
Interest coverage, actual | Interest / Debt     6.15     6.15  
Interest coverage, required | Interest / Debt     2.00     2.00  
Maximum [Member]              
Debt covenants [Abstract]              
Debt to EBITDA, actual | Debt / EBITDA [1]     2.79     2.79  
Debt to EBITDA, required | Debt / EBITDA [1]     3.50     3.50  
LIBOR [Member]              
Schedule of long term debt [Abstract]              
Interest rate     0.75%        
Long-term Revolving Credit Facility [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 142,061 $ 100,712      
Long term debt additional disclosures [Abstract]              
Average effective interest rate     2.08% 1.77%      
Remaining borrowing capacity     $ 121,800        
Revolving Credit Facility [Member]              
Schedule of long term debt [Abstract]              
Proceeds from additional borrowings £ 50,000 € 45,000          
Long term debt additional disclosures [Abstract]              
Remaining borrowing capacity     264,500        
Uncommitted Loans [Member]              
Short-term borrowings [Abstract]              
Short-term borrowings     19,768 $ 19,192      
Loans of Foreign Subsidiaries [Member]              
Short-term borrowings [Abstract]              
Short-term borrowings     278 938      
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%     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 27,000      
Interest rate, stated percentage     3.65%     3.65%  
Maturity date     May 31, 2024        
4.19% Senior Notes due November 2025 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 25,000 0      
Interest rate, stated percentage     4.19%     4.19%  
Maturity date     Nov. 30, 2025        
Debt instrument amount     $ 25,000        
1.27% Euro-denominated Senior Notes due May 2024 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 57,333 60,024      
Interest rate, stated percentage     1.27%     1.27%  
Maturity date     May 31, 2024        
1.71% Euro-denominated Senior Notes due May 2027 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 45,866 48,019      
Interest rate, stated percentage     1.71%     1.71%  
Maturity date     May 31, 2027        
3.06% Euro-denominated Senior Notes due November 2023 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 43,856 45,914      
Interest rate, stated percentage     3.06%     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     $ 76,662 80,260      
Interest rate, stated percentage     1.85%     1.85%  
Maturity date     Nov. 30, 2022        
4.47% Senior Notes due November 2018 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 0 25,000      
Interest rate, stated percentage     4.47%     4.47%  
Maturity date     Nov. 30, 2018        
2.53% British Pound-denominated Notes due November 2023 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 31,884 0      
Interest rate, stated percentage     2.53%     2.53%  
Maturity date     Nov. 30, 2023        
Debt instrument amount | £           £ 25,000  
2.76% British Pound-denominated Notes due November 2025 [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 31,884 0      
Interest rate, stated percentage     2.76%     2.76%  
Maturity date     Nov. 30, 2025        
Debt instrument amount | £           £ 25,000  
Term Loan [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 132,313 $ 141,375      
Interest rate, stated percentage     3.48% 2.58%   3.48%  
Various Other Notes [Member]              
Schedule of long term debt [Abstract]              
Long term debt     $ 923 $ 1,068      
Private Placement Notes [Member]              
Schedule of long term debt [Abstract]              
Debt instrument amount | £           £ 50,000  
[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.