Commitments and Contingencies Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leases [Abstract]
2013	$ 3,007,000
2014	2,685,000
2015	2,633,000
2016	1,559,000
Operating Leases, Future Minimum Payments, Due in Five Years	782,000
2017 and thereafter (through 2020)	1,266,000
Total future minimum lease commitments	11,932,000
Operating Leases, Rent Expense, Net	$ 5,000,000	$ 4,800,000	$ 4,200,000