Retirement Plans And Postretirement Benefits (Components Of Net Postretirement Costs) (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] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 386	$ 151		$ 750
Interest cost	2,200	854		5,983
Amortization of prior service (credit) cost		0		0
Mark-to-market loss (gain) loss		0		18,431
Net Cost		1,005		19,949
Predecessor [Member] | Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	281	98		1,107
Interest cost	94	554		2,669
Amortization of prior service (credit) cost		(12)		2
Mark-to-market loss (gain) loss		0		(534)
Net Cost		640		700
Successor [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	386		$ 1,325
Interest cost	2,200		5,744
Amortization of prior service (credit) cost	0
Mark-to-market loss (gain) loss	716		(2,322)
Net Cost	1,417		(193)
Successor [Member] | Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	281		698
Interest cost	94		243
Amortization of prior service (credit) cost	0
Mark-to-market loss (gain) loss	1,843		(220)
Net Cost	1,484		423
Postretirement Benefit Costs [Member] | Predecessor [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	142	223		396
Amortization of prior service (credit) cost		0		0
Plan amendment / curtailment		0		0
Mark-to-market loss (gain) loss		0		1,151
Net Cost		223		1,547
Postretirement Benefit Costs [Member] | Predecessor [Member] | Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	9		71
Interest cost	289	433		976
Amortization of prior service (credit) cost		0		(180)
Plan amendment / curtailment		0		(294)
Mark-to-market loss (gain) loss		0		1,456
Net Cost		$ 442		$ 2,029
Postretirement Benefit Costs [Member] | Successor [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		0
Interest cost	142		360
Amortization of prior service (credit) cost	0
Plan amendment / curtailment	0		0
Mark-to-market loss (gain) loss	(100)		(191)
Net Cost	42		169
Postretirement Benefit Costs [Member] | Successor [Member] | Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5		4
Interest cost	289		764
Amortization of prior service (credit) cost	0
Plan amendment / curtailment	0		(993)
Mark-to-market loss (gain) loss	(621)		(225)
Net Cost	$ (327)		$ (450)