Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013 country	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Minimum number of countries for which entity has operations	40
Percentage of sales outside of the Americas during the period	58.00%	59.00%
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)	2 years
Duration of derivative contracts entered into by the entity to hedge risk of loss	36 months		36 months
Forward Contracts [Member]
Derivative [Line Items]
Estimated amount of reclassification of gains on derivative instruments from accumulated other comprehensive income to net sales	6,300,000
Estimated amount of reclassification of gains on derivative instruments from accumulated other comprehensive income to cost of sales	1,400,000
Estimated amount of reclassification of gains on derivative instruments from accumulated other comprehensive income to operating expenses	781,000
Other Derivatives [Member]
Derivative [Line Items]
Foreign currency forward contracts notional amount	50,000,000		69,000,000
Maximum [Member] | Forward Contracts [Member]
Derivative [Line Items]
Percentage of derivative risk hedged	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%
Duration of derivative contracts entered into by the entity to hedge risk of loss	120 days