Retirement Plans And Postretirement Benefits (Fair Value Of Assets Of, And The Funded Status Of, Postretirement Plans) (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
Changes in Benefit Obligation:
Gross benefits paid		$ (5,300)
Changes in Plan Assets:
Employer contributions		4,300
Gross benefits paid		(5,300)
U.S. [Member]
Changes in Plan Assets:
Fair value of plan assets at beginning of year			$ 93,897
Fair value of plan assets at end of year	$ 93,897		100,905
Foreign [Member]
Changes in Plan Assets:
Fair value of plan assets at beginning of year			11,293
Fair value of plan assets at end of year	11,293		11,871
Predecessor [Member]
Changes in Plan Assets:
Funded status:	(6,978)
Predecessor [Member] | U.S. [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	146,790		142,126
Service cost	386	151		$ 750
Interest cost	2,200	854		5,983
Foreign currency exchange rates	0
Actuarial loss (gain)	(3,896)
Gross benefits paid	(3,354)
Net benefit obligation at end of year	142,126	146,790
Changes in Plan Assets:
Fair value of plan assets at beginning of year	97,473		93,897
Employer contributions	2,505
Gross benefits paid	(3,354)
Fair value of plan assets at end of year	93,897	97,473
Funded status:	(48,229)
Prior service credit	0
Current liabilities	(437)
Non-current liabilities	(47,792)
Net amount recognized	(48,229)
Predecessor [Member] | Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	18,512		18,271
Service cost	281	98		1,107
Interest cost	94	554		2,669
Foreign currency exchange rates	(480)
Actuarial loss (gain)	377
Gross benefits paid	(14)
Net benefit obligation at end of year	18,271	18,512
Changes in Plan Assets:
Fair value of plan assets at beginning of year	12,811		11,293
Employer contributions	170
Gross benefits paid	(14)
Fair value of plan assets at end of year	11,293	12,811
Prior service credit	(95)
Current liabilities	(253)
Non-current liabilities	(6,725)
Net amount recognized	(6,978)
Successor [Member]
Changes in Plan Assets:
Fair value of plan assets at end of year			11,871
Funded status:			(6,366)
Successor [Member] | U.S. [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year			142,126
Service cost	386		1,325
Interest cost	2,200		5,744
Foreign currency exchange rates			0
Actuarial loss (gain)			1,293
Gross benefits paid			(10,258)
Net benefit obligation at end of year	142,126		140,230
Changes in Plan Assets:
Fair value of plan assets at beginning of year			93,897
Employer contributions			8,710
Gross benefits paid			(10,258)
Fair value of plan assets at end of year	93,897		100,905
Funded status:			(39,325)
Prior service credit			0
Current liabilities			(435)
Non-current liabilities			(38,890)
Net amount recognized			(39,325)
Successor [Member] | Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year			18,271
Service cost	281		698
Interest cost	94		243
Foreign currency exchange rates			(527)
Actuarial loss (gain)			(18)
Gross benefits paid			(564)
Net benefit obligation at end of year	18,271		18,237
Changes in Plan Assets:
Fair value of plan assets at beginning of year			11,293
Employer contributions			854
Gross benefits paid			(564)
Fair value of plan assets at end of year	11,293
Prior service credit			0
Current liabilities			(128)
Non-current liabilities			(6,238)
Net amount recognized			(6,366)
Postretirement Benefit Costs [Member] | Predecessor [Member] | U.S. [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	11,395		10,859
Service cost	0	0
Interest cost	142	223		396
Foreign currency exchange rates	0
Actuarial loss (gain)	(100)
Gross benefits paid	(578)
Plan amendment	0
Net benefit obligation at end of year	10,859	11,395
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0		0
Employer contributions	578
Gross benefits paid	(578)
Fair value of plan assets at end of year	0	0
Funded status:	(10,859)
Prior service credit	0
Current liabilities	(1,298)
Non-current liabilities	(9,561)
Net amount recognized	(10,859)
Postretirement Benefit Costs [Member] | Predecessor [Member] | Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year	13,457		11,296
Service cost	5	9		71
Interest cost	289	433		$ 976
Foreign currency exchange rates	(1,489)
Actuarial loss (gain)	(621)
Gross benefits paid	(345)
Plan amendment	0
Net benefit obligation at end of year	11,296	13,457
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0		0
Employer contributions	345
Gross benefits paid	(345)
Fair value of plan assets at end of year	0	0
Funded status:	(11,296)
Prior service credit	0
Current liabilities	(755)
Non-current liabilities	(10,541)
Net amount recognized	(11,296)
Postretirement Benefit Costs [Member] | Successor [Member] | U.S. [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year			10,859
Service cost	0		0
Interest cost	142		360
Foreign currency exchange rates			0
Actuarial loss (gain)			(191)
Gross benefits paid		(1,600)	(853)
Plan amendment			0
Net benefit obligation at end of year	10,859		10,175
Changes in Plan Assets:
Fair value of plan assets at beginning of year			0
Employer contributions		1,600	853
Gross benefits paid		$ (1,600)	(853)
Fair value of plan assets at end of year	0		0
Funded status:			(10,175)
Prior service credit			0
Current liabilities			(1,134)
Non-current liabilities			(9,041)
Net amount recognized			(10,175)
Postretirement Benefit Costs [Member] | Successor [Member] | Foreign [Member]
Changes in Benefit Obligation:
Net benefit obligation at beginning of year			11,296
Service cost	5		4
Interest cost	289		764
Foreign currency exchange rates			709
Actuarial loss (gain)			(225)
Gross benefits paid			(855)
Plan amendment			(993)
Net benefit obligation at end of year	11,296		10,700
Changes in Plan Assets:
Fair value of plan assets at beginning of year			0
Employer contributions			855
Gross benefits paid			(855)
Fair value of plan assets at end of year	$ 0		0
Funded status:			(10,700)
Prior service credit			0
Current liabilities			(738)
Non-current liabilities			(9,962)
Net amount recognized			$ (10,700)