Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases [Abstract]
Operating Leases, Rent Expense, Net	$ 4,500,000	$ 4,400,000	$ 3,600,000
Operating Leases, Future Minimum Payments Due, Current	4,006,000
Operating Leases, Future Minimum Payments, Due in Two Years	1,273,000
Operating Leases, Future Minimum Payments, Due in Three Years	781,000
Operating Leases, Future Minimum Payments, Due in Four Years	403,000
Operating Leases, Future Minimum Payments, Due in Five Years	52,000
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	$ 6,515,000