Other Liabilities (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Other Liabilities
Other current liabilities	$ 7,512,000	$ 7,505,000
Loss contingency	4,800,000	4,900,000
Unrecognized tax benefit	2,700,000	2,600,000
Period over which loss contingency is expected to be settled	5 years
Other long term liabilities	$ 217,000	$ 288,000