Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes
Amount accrued for the potential payment of interest and penalties	$ 4,000	$ 7,000
Reconciliation of the amount of unrecognized tax benefits
Balance at the beginning of the period	101,000	230,000
Increases - current year tax positions	10,000	11,000
Increases - prior year tax positions		5,000
Settlements		(71,000)
Lapse of statute of limitations	(41,000)	(74,000)
Balance at the end of the period	$ 70,000	$ 101,000