Supplementary Balance Sheet Detail (Schedule Of Analysis Of The Allowance For Doubtful Accounts) (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
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 5,877	$ 6,969	$ 244	$ 6,262
Additions	244	85	129	3,520
Deductions	0	(1,177)	(47)	(2,813)
Balance at end of year	$ 244	$ 5,877	$ 326	$ 6,969