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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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