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Income Taxes (Schedule Of Components Of Income From Continuing Operations Before Income Taxes And Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 44,500	$ 94,100	$ 38,800	$ 40,900	$ 141,800	$ 91,000	$ 93,900	$ 12,600	$ 218,289	$ 339,346	$ 254,194
Federal - Current									58,039	119,338	92,828
Federal - Deferred									15,853	(382)	(9,067)
State - Current and deferred									6,806	(2,570)	16,298
Total									$ 80,698	$ 116,386	$ 100,059

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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