Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2014	Aug. 03, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Entity Information [Line Items]
Provision for federal income tax, at statutory rate	$ 52,343		$ 124,054	$ 124,083
State income tax provision, net of federal income tax effect	1,065		1,035	672
Partnership income not subject to entity-level tax	(52,343)		(124,054)	(124,083)
Manufacturing deduction	0		0	0
Other, net	0		0	0
Total provision	$ 1,065		$ 1,035	$ 672
Predecessor [Member]
Entity Information [Line Items]
Provision for federal income tax, at statutory rate		$ 195,880
State income tax provision, net of federal income tax effect		14,729
Partnership income not subject to entity-level tax		0
Manufacturing deduction		(12,214)
Other, net		(72)
Total provision		$ 198,323			$ 199,388