Income Taxes Uncertain Tax Positions (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits at January 1	$ 120,859,000	$ 122,844,000	$ 115,105,000
Gross increases - tax positions in prior period	0	0	9,960,000
Gross decreases - tax positions in prior period	(15,774,000)	(5,707,000)	(2,221,000)
Gorss increases - tax positions in current period	26,864,000	6,202,000	0
Gross decreases - tax positions in current period	0	(2,480,000)	0
Unrecognized Tax Benefits at December 31	131,949,000	120,859,000	122,844,000
Unrecognized tax benefits that would impact effective tax rate	$ 79,200,000	$ 80,400,000
Unrecognized tax benefit more likely than not percentage threshold	50.00%