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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended
Feb. 28, 2017
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts   $ 14,896,000 $ 5,669,000    
Debt covenant ratio of senior debt to EBITDA   3.25      
Debt covenant ratio of total debt to EBITDA   3.75      
Debt covenant ratio of EBITDA to cash interest expense   4.25      
Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Carrying amount of debt   $ 397,550,000 421,500,000    
Line of credit facility, maximum borrowing capacity       $ 750,000,000  
Line of credit facility with accordian feature, maximum borrowing capacity       $ 250,000,000  
Remaining borrowing capacity   $ 452,450,000 $ 428,500,000    
Revolving Credit Agreement [Member] | Euro Member Countries, Euro          
Debt Instrument [Line Items]          
Stated interest rate   2.96% 2.65%    
Senior Notes [Member] | 3.97% Senior Notes [Member]          
Debt Instrument [Line Items]          
Carrying amount of debt   $ 100,000,000 $ 100,000,000    
Stated interest rate         3.97%
Converted amount with accrued interest         $ 100,000,000
Percent allowed to be prepaid         100.00%
Lines of Credit [Member]          
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts   14,600,000 $ 5,300,000    
Line of credit facility, maximum borrowing capacity   $ 59,000,000      
Line of credit, interest rate at period end   2.60% 2.33%    
Bank Overdrafts [Member]          
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts   $ 296,000 $ 369,000    
Repayment period   2 days      
Capital Lease Obligations [Member]          
Debt Instrument [Line Items]          
Carrying amount of debt   $ 7,896,000 4,541,000    
Foreign Bank Borrowings [Member]          
Debt Instrument [Line Items]          
Carrying amount of debt   $ 742,000 $ 886,000    
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 850,000,000        
Debt fees and expenses 2,542,000        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | United Kingdom, Pounds          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 600,000,000        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Euro Member Countries, Euro          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 600,000,000        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Switzerland, Francs          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 600,000,000        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 1.10%        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | one-month LIBOR [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 1.70%        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 0.10%        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022 [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 0.70%        
Revolving Credit Agreement [Member] | Fourth Amendment, Maturity February 2022, Accordion Feature [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 350,000,000