Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Foreign Currency Forward Contracts [Member]	Dec. 31, 2012 Interest Rate Swap [Member]
Foreign currency forward contracts [Abstract]
Notional amount of cash flow hedge instruments		$ 11,005	$ 60,000
Unrealized gain from foreign currency forward contract		380
Interest rate swap agreement [Abstract]
Maturity date			Sep. 28, 2015
Interest rate swap, fixed rate (in hundredths)			0.92%
Fair value of swap			930
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 419