Interest and other income / (expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest (expense) / income	$ (70)	$ 0	$ (93)	$ 42
Other (expense) / income	0	0	(2)	(10)
Total	$ (70)	$ 0	$ (95)	$ 32