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Debt (Narrative) (Details)
€ in Thousands
1 Months Ended 6 Months Ended
Sep. 30, 2013
USD ($)
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts     $ 20,219,000 $ 22,680,000  
Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Carrying amount of debt     352,000,000 379,700,000  
Line of credit facility, maximum borrowing capacity $ 750,000,000        
Line of credit facility with accordian feature, maximum borrowing capacity $ 1,000,000,000        
Remaining borrowing capacity     $ 398,000,000 370,300,000  
Revolving Credit Agreement [Member] | Euro Member Countries, Euro          
Debt Instrument [Line Items]          
Carrying amount of debt   € 0   $ 0  
Stated interest rate   1.56% 1.56% 1.50%  
Revolving Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 1.10%        
Revolving Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Variable basis spread 1.70%        
Senior Notes [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt covenant ratio of EBITDA to cash interest expense         4.25
Senior Notes [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt covenant ratio of senior debt to EBITDA         3.25
Debt covenant ratio of total debt to EBITDA         4.00
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%
Senior Notes [Member] | Adjusted for Certain Acquisitons [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt covenant ratio of senior debt to EBITDA         3.50
Debt covenant ratio of total debt to EBITDA         4.25
Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 500,000,000        
Revolving Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Variable rate basis LIBOR        
Lines of Credit [Member]          
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts     20,200,000 $ 22,500,000  
Line of credit facility, maximum borrowing capacity     $ 56,000,000    
Line of credit, interest rate at period end   1.30% 1.30% 1.56%  
Bank Overdrafts [Member]          
Debt Instrument [Line Items]          
Borrowings under lines of credit and overdrafts     $ 19,000 $ 180,000  
Repayment period   2 days