Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments and Contingencies [Abstract]
Operating Leases, Rent Expense	$ 915,000	$ 1,011,000	$ 983,000
Operating Leases, Future Minimum Payments Due [Abstract]
Operating Leases, Future Minimum Payments Due, Current	675,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	761,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	690,000,000
Operating Leases, Future Minimum Payments, Due in Four Years	718,000,000
Operating Leases, Future Minimum Payments, Due in Five Years	366,000,000
Operating Leases, Future Minimum Payments Due	$ 3,210,000,000