Other Income, net of expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income, net of expenses [Abstract]
Interest income	$ 225	$ 332	$ 803	$ 866
Gain on investments	576	22	412	73
License fee income	256	268	547	762
Other	43	214	123	604
Total	$ 1,100	$ 836	$ 1,885	$ 2,305