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Retirement Plans And Postretirement Benefits (Narrative) (Details) $ in Thousands		6 Months Ended	7 Months Ended	12 Months Ended
	Mar. 27, 2015 USD ($)	Jun. 30, 2015 USD ($) shares	Aug. 14, 2015 USD ($)	Dec. 31, 2016 USD ($) years	Dec. 31, 2013 USD ($) shares	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Percentage of increase in salaries based on the final average wages				6.00%
Percentage of equity in GTI				50.00%
Option to remain in defined benefit plan for an additional period, in years				5 years
Projected benefit obligations settled	$ 62,000
Defined benefit plan, accumulated benefit obligation				$ 157,000		$ 158,900
Employer contributions			$ 4,300
Gross benefits paid			5,300
Employee retirement age, years | years				65
Assets of trust approximately				$ 700		800
Basic contribution to savings plan by employees in percentage				5.00%
Additional basic contribution to savings plan by employees in percentage				45.00%
Stock issued during period, shares, employee savings plan | shares		321,107			581,006
Stock issued during period, value, employee benefit plan		$ 1,400			$ 4,400
Pension and other postretirement benefit contributions				$ 2,500
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment plan percentage				100.00%
Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets				$ 11,871
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets				$ 100,905		93,897
U.S. [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment plan percentage				20.00%
U.S. [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment plan percentage				80.00%
U.S. [Member] | Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				$ 8,710
Gross benefits paid				10,258
Defined Benefit Plan, Fair Value of Plan Assets				100,905		93,897
U.S. [Member] | Successor [Member] | Postretirement Benefit Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			1,600	853
Gross benefits paid			$ 1,600	853
Defined Benefit Plan, Fair Value of Plan Assets				0		0
Trust
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets				800		400
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets				11,871		11,293
Foreign [Member] | Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				854
Gross benefits paid				564
Defined Benefit Plan, Fair Value of Plan Assets						11,293
Foreign [Member] | Successor [Member] | Postretirement Benefit Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				855
Gross benefits paid				855
Defined Benefit Plan, Fair Value of Plan Assets				$ 0		$ 0
First Of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Units of fund that invest in our common stock		3.00%		3.00%	3.00%
Employee contribution percent		100.00%		100.00%	100.00%
Next of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Units of fund that invest in our common stock		5.00%		5.00%	5.00%
Employee contribution percent		20.00%		20.00%	20.00%

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Employee retirement age.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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