Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for federal income tax, at statutory rate	$ 70,062	$ 69,425	$ 124,018
State income tax provision, net of federal income tax effect	728	22	1,280
Partnership income not subject to entity-level tax	(70,062)	(69,425)	(124,018)
Total provision	$ 728	$ 22	$ 1,280