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Derivative Instruments And Hedging Activities (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
country
Jun. 30, 2016
Jun. 30, 2017
USD ($)
country
Jun. 30, 2016
Dec. 31, 2016
USD ($)
Derivative [Line Items]          
Minimum number of countries for which entity has operations | country 50   50    
Percentage of sales outside of the Americas during the period 62.00% 63.00% 61.00% 62.00%  
Period of protection against the reduction in value caused by a fluctuation, minimum (in number of years)     1 year    
Period of protection against the reduction in value caused by a fluctuation, maximum (in number of years)     3 years    
Foreign currency forward contracts notional amount $ 301,437   $ 301,437   $ 295,505
Cost Of Sales [Member]          
Derivative [Line Items]          
Gains (losses) expected to be reclassified from AOCI to earnings     (300)    
Forward Contracts [Member] | Net Sales [Member]          
Derivative [Line Items]          
Gains (losses) expected to be reclassified from AOCI to earnings     (700)    
Forward Contracts [Member] | Operating Expenses [Member]          
Derivative [Line Items]          
Gains (losses) expected to be reclassified from AOCI to earnings     (300)    
Other Derivatives [Member]          
Derivative [Line Items]          
Foreign currency forward contracts notional amount $ 46,000   $ 46,000   $ 60,000
Maximum [Member] | Forward Contracts [Member]          
Derivative [Line Items]          
Percentage of derivative risk hedged 100.00%   100.00%    
Duration of derivative contracts entered into by the entity to hedge risk of loss     40 months    
Maximum [Member] | Other Derivatives [Member]          
Derivative [Line Items]          
Percentage of derivative risk hedged 90.00%   90.00%    
Duration of derivative contracts entered into by the entity to hedge risk of loss     120 days