Commitments and Contingencies Future minimum lease payments for Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases [Abstract]
Operating Leases, Future Minimum Payments, Due in Twelve Months	$ 1,432,000
Operating Leases, Future Minimum Payments, Due in Two Years	1,236,000
Operating Leases, Future Minimum Payments, Due in Three Years	932,000
Operating Leases, Future Minimum Payments, Due in Four Years	886,000
Operating Leases, Future Minimum Payments, Due in Five Years	885,000
Operating Leases, Future Minimum Payments, Due Thereafter	1,725,000
Operating Leases, Future Minimum Payments Due	7,096,000
Future minimum lease payments for land lease, Total	5,600,000
Operating Leases, Rent Expense	1,700,000	1,900,000	2,100,000
Deferred Rent Credit	251,000	294,000
Deferred Rent Credit, Current	$ 36,000	$ 44,000