Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 60,420,000	$ 79,143,000	$ 116,777,000
Deferred Expense (Benefit), Domestic	38,781,000	66,287,000	(56,325,000)
Domestic, Total	99,201,000	145,430,000	60,452,000
Current Expense, Foreign	22,011,000	10,584,000	9,140,000
Deferred Expense (Benefit), Foreign	2,338,000	(2,275,000)	3,558,000
Foreign, Total	24,349,000	8,309,000	12,698,000
Current Expense, Total	82,431,000	89,727,000	125,917,000
Deferred Expense (Benefit), Total	41,119,000	64,012,000	(52,767,000)
Total expense (benefit)	123,550,000	153,739,000	73,150,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic	469,000,000	574,000,000	343,000,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 49,000,000	$ 29,000,000	$ 39,000,000