Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Current income tax provision (benefit)	$ 600,000	$ (1,600,000)
Deferred income tax provision (benefit)	6,000,000	17,000,000
Total income tax provision (benefit)	6,582,000	15,363,000
Pre-tax income for provision on tax	7,331,000	36,912,000
Unrecognized tax benefits, interest on income taxes accrued	30,300,000
Unrecognized tax benefits, income tax penalties accrued	24,300,000
No longer subject to examination for years prior to	2007
Potential change in unrecognized tax benefits is reasonably possible during next twelve months, amount of unrecorded benefit tax positions	60,400,000
Reduction in unrecognized tax benefits	86,000,000
Statute of limitations to expire during next twelve months	2007 and 2008
Unrecognized tax benefits that would reduce the income tax provision	108,000,000
Uncertain Tax Positions [Member]
Income Tax Contingency [Line Items]
Deferred income tax provision (benefit) for UTPs	200,000	700,000
Unrecognized tax benefits relating to UTPs	115,000,000
Current tax provision	$ 500,000	$ (2,600,000)