Income Taxes (Reconciliation Of Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax computed at statutory rate	$ (60,037)	$ 422,999	$ 163,625
State income taxes, net of federal tax benefit	(14,056)	40,385	13,641
Domestic production activities deduction	4,170	(35,200)	(20,998)
Noncontrolling interest in net income	(26,903)	(24,155)	(17,431)
Goodwill	119,722
Other	(3,485)	2,031	2,335
Income tax provision total	$ 19,411	$ 406,060	$ 141,172