Fixed Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Operating Leases, Rent Expense	$ 3,100,000	$ 3,000,000	$ 2,500,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2,534,000
Rental Income, Nonoperating	163,000	150,000	126,000
Capital Leases, Future Minimum Payments Due in Two Years	2,390,000
Operating Leases, Future Minimum Payments, Due in Three Years	2,168,000
Operating Leases, Future Minimum Payments, Due in Four Years	2,363,000
Operating Leases, Future Minimum Payments, Due in Five Years	1,915,000
Operating Leases, Future Minimum Payments, Due Thereafter	8,561,000
Operating Leases, Future Minimum Payments Due	$ 19,931,000