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Derivative Instruments and Hedging Activities (Details Textual)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
CAD
Dec. 31, 2011
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
CAD
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Other contract [Member]
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Other contract [Member]
CAD
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
CAD
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
CAD
Derivative Instruments and Hedging Activities (Textual) [Abstract]                            
Notional amount of Canadian forward contracts         $ 11,900,000 12,100,000 $ 8,500,000 8,600,000     $ 1,900,000 1,900,000 $ 1,500,000 1,500,000
Notional amount of Canadian forward contracts with maturity periods greater than 12 months                 4,600,000 4,700,000        
Maximum maturity period for Canadian forward contracts with maturity periods greater than 12 months         21 months 21 months                
Maturity period for Canadian forward contracts     12 months                      
Unrealized pretax loss on outstanding derivatives accumulated in other comprehensive loss expected to be reclassified within 12 months 2,000   2,000                      
Gains and Losses from derivative contracts not designated as hedging instruments recognized in net sales $ 47,000 $ 400,000 $ 100,000 $ 600,000