Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 156,339,000	$ 60,420,000	$ 79,143,000
Deferred Expense (Benefit), Domestic	11,448,000	37,176,000	64,774,000
Domestic, Total	167,787,000	97,596,000	143,917,000
Current Expense, Foreign	23,029,000	22,011,000	10,584,000
Deferred Expense (Benefit), Foreign	469,000	2,338,000	(2,275,000)
Foreign, Total	23,498,000	24,349,000	8,309,000
Current Expense, Total	179,368,000	82,431,000	89,727,000
Deferred Expense (Benefit), Total	11,917,000	39,514,000	62,499,000
Total expense (benefit)	191,285,000	121,945,000	152,226,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic	624,000,000	469,000,000	574,000,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 78,000,000	$ 49,000,000	$ 29,000,000