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Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, beginning of period $ 258,016 $ 326,088 $ 126,299
Assumed with merger 0 0 121,667
Decreases related to tax positions taken during the current period 0 0 (10,029)
Increases related to tax positions taken during a prior period 2,699 55,385 37,303
Decreases related to tax positions taken during a prior period (79,719) (14,025) (10,414)
Increases related to tax positions taken during the current period 1,620 1,441 82,973
Decreases related to settlements with taxing authorities 0 (94,779) (1,389)
Reductions as a result of a lapse of the statute of limitations (10,753) (16,094) (20,322)
Unrecognized Tax Benefits, end of period $ 171,863 $ 258,016 $ 326,088