Income Taxes (Components Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal	$ 120,437	$ 123,598	$ 74,202
State	21,248	15,858	15,635
Total current income tax expense (benefit)	141,685	139,456	89,837
Federal	38,549	21,542	28,593
State	5,093	4,002	4,143
Total deferred income tax expense (benefit)	43,642	25,544	32,736
Total provision for income taxes	$ 185,327	$ 165,000	$ 122,573