Commitments and Contingencies Future Minimum Rental Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
2012	$ 14,012,000
2013	12,723,000
2014	10,298,000
2015	8,157,000
2016	6,365,000
Thereafter	26,713,000
Total	78,268,000
Operating Leases, Rent Expense, Net	$ 16,000,000	$ 15,000,000	$ 16,000,000