Commitments and Contingencies Operating Lease (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Leases, Future Minimum Payments Due [Abstract]
2012	$ 46,974,000
2013	37,972,000
2014	24,663,000
2015	22,251,000
2016	19,699,000
Thereafter	33,689,000
Total	185,248,000
Operating Leases, Rent Expense	$ 63,200,000	$ 57,000,000	$ 69,300,000