Income Taxes (Schedule Of Valuation Allowance Activity) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Aug. 14, 2015	Dec. 31, 2016	Dec. 31, 2014
Predecessor [Member]
Valuation Allowance [Line Items]
Balance at beginning of year	$ 115,449	$ 95,721		$ 20,411
(Credited) / charged to income		29,363		74,157
Translation adjustment		(1,467)		(800)
Changes attributable to movement in underlying assets		(8,168)		1,953
Balance at end of year		$ 115,449		$ 95,721
Successor [Member]
Valuation Allowance [Line Items]
Balance at beginning of year			$ 165,539
(Credited) / charged to income	6,780		78,469
Translation adjustment	(101)		583
Changes attributable to movement in underlying assets	43,411		250
Balance at end of year	$ 165,539		$ 244,841