Derivatives (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivatives [Abstract]
Number of outstanding foreign exchange contracts	7	9
Notional amount of foreign exchange contracts	$ 600,000	$ 1,300,000
Exchange rate, minimum	$ 1.2389	$ 1.2910
Exchange rate, maximum	$ 1.3072	$ 1.3553
Net gain (loss) on foreign exchange contracts	$ 3,000	$ 41,000