Hedging - Derivatives No Longer Qualifying as Hedging Instruments (Details)	3 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2013 Transferred from Hedging to Non-hedging Instruments Euro call and put option contracts EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q1 2013 Purchased Euro put option EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q1 2013 Sold Euro call option USD ($)	Mar. 31, 2013 Foreign exchange option, settled in Q1 2013 Sold Euro call option EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q2 2013 Purchased Euro put option USD ($)	Mar. 31, 2013 Foreign exchange option, settled in Q2 2013 Purchased Euro put option EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q2 2013 Sold Euro call option USD ($)	Mar. 31, 2013 Foreign exchange option, settled in Q2 2013 Sold Euro call option EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q3 2013 Purchased Euro put option USD ($)	Mar. 31, 2013 Foreign exchange option, settled in Q3 2013 Purchased Euro put option EUR (€)	Mar. 31, 2013 Foreign exchange option, settled in Q3 2013 Sold Euro call option USD ($)	Mar. 31, 2013 Foreign exchange option, settled in Q3 2013 Sold Euro call option EUR (€)
Derivative [Line Items]
Notional amount of currency derivatives included in transferred positions			€ 71,000,000	€ 25,000,000		€ 25,000,000		€ 19,000,000		€ 19,000,000		€ 27,000,000		€ 27,000,000
Realized Losses Recorded in Net sales		(620,000)			(620,000)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments		3,409,000					(7,000)		1,586,000		76,000		1,754,000
Deferred net gains (losses) in Accumulated other comprehensive income (loss) expected to be reclassified into income	$ (5,848,000)	$ (4,517,000)					$ (928,000)		$ (1,059,000)		$ (1,447,000)		$ (1,083,000)