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Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details) $ in Thousands | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Aug. 14, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Reportable Segments | segment |  |  | 2 |  |
Net sales |  |  | $ 437,963 | $ 533,040 | $ 825,145
Industrial Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Additions to lower of cost or market reserve |  |  | 19,000 |  |
Other expense (income), net |  | $ 2,700 |  |  | 34,500
Preferred Stock Issuance Expense |  | 3,200 |  |  |
Mark To Market Adjustment |  |  |  |  | 3,500
Impairment of long-lived assets and goodwill |  | 35,400 |  |  | 76,100
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other expense (income), net |  |  |  |  | 6,300
Preferred Stock Issuance Expense |  | 19,400 |  |  |
Mark To Market Adjustment |  |  |  |  | (6,300)
Proxy Context Costs |  |  |  |  | 2,400
Predecessor [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Additions to lower of cost or market reserve |  | 0 |  |  | 0
Net sales | $ 193,133 | 339,907 |  |  | 825,145
Total segment operating income (loss) | (12,563) | (68,249) |  |  | (119,974)
Other expense (income), net | (813) | 1,421 |  |  | 2,920
Interest expense |  | 26,211 |  |  | 35,736
Interest income | (6) | (363) |  |  | (320)
Loss before income taxes | (21,743) | (95,518) | 116,421 |  | (158,310)
Inventory write-downs |  | 0 |  |  | 19,600
Restructuring Costs |  | 4,422 |  |  | 40,350
Impairment of long-lived assets and goodwill |  | 35,381 |  |  | 75,650
Predecessor [Member] | Industrial Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 193,133 | 339,907 |  |  | 825,145
Total segment operating income (loss) | (2,529) | (24,900) |  |  | (51,300)
Restructuring Costs |  | 2,696 |  |  | 34,479
Predecessor [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total segment operating income (loss) | (10,034) | (43,349) |  |  | (68,674)
Restructuring Costs |  | $ 1,726 |  |  | $ 5,871
Successor [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Additions to lower of cost or market reserve | 0 |  | 18,974 |  |
Net sales | 193,133 |  | 437,963 |  |
Total segment operating income (loss) | (12,563) |  | (92,053) |  |
Other expense (income), net | (813) |  | (2,188) |  |
Interest expense | 9,999 |  | 26,914 |  |
Interest income | (6) |  | (358) |  |
Loss before income taxes | (21,743) |  | (116,421) |  |
Inventory write-downs | 0 |  | 1,770 |  |
Restructuring Costs | 389 |  | 2,365 |  |
Impairment of long-lived assets and goodwill | 0 |  | 2,843 |  |
Successor [Member] | Industrial Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  |  | 437,963 |  |
Total segment operating income (loss) |  |  | (63,827) |  |
Restructuring Costs | 28 |  | 1,842 |  |
Successor [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total segment operating income (loss) |  |  | (28,226) |  |
Restructuring Costs | $ 361 |  | $ 523 |  |

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