Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Foreign Currency Forward Contracts [Member]
Foreign Currency Derivatives [Abstract]
Notional amount of cash flow hedge instruments	$ 0	$ 0
Interest Rate Swap [Member]
Derivative Instruments [Abstract]
Notional amount of interest rate derivatives	60,000
Interest rate swap, fixed rate (in hundredths)	0.92%
Maturity date	Sep. 28, 2015
Fair value of swap	(843)	(930)
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ (405)