Leases (details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases [Abstract]
Land Buildings And Equipment Expiration Date	various years through 2095
Operating Leases, Rent Expense, Minimum Rentals	$ 5,400,000	$ 5,100,000	$ 5,300,000
Operating And Capital Leases Table [Abstract]
Operating Leases, Future Minimum Payments Due, Current	4,929,000
Operating Leases, Future Minimum Payments, Due in Two Years	4,841,000
Operating Leases, Future Minimum Payments, Due in Three Years	5,078,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,042,000
Operating Leases, Future Minimum Payments, Due in Five Years	5,018,000
Operating Leases, Future Minimum Payments, Due Thereafter	24,659,000
Operating Leases, Future Minimum Payments Due	49,567,000
Capital Leases, Future Minimum Payments Due, Current	443,000
Capital Leases, Future Minimum Payments Due in Two Years	313,000
Capital Leases, Future Minimum Payments Due in Three Years	118,000
Capital Leases, Future Minimum Payments Due in Four Years	23,000
Capital Leases, Future Minimum Payments Due in Five Years	0
Capital Leases, Future Minimum Payments Due Thereafter	0
Capital Leases, Future Minimum Payments Due	897,000
Future Minimum Payments Due Current	5,372,000
Future Minimum Payments Due In Two Years	5,154,000
Future Minimum Payments Due In Three Years	5,196,000
Future Minimum Payments Due In Four Years	5,065,000
Future Minimum Payments Due In Five Years	5,018,000
Future Minimum Payments Due Thereafter	24,659,000
Future Minimum Payments Due Total	$ 50,464,000