Guarantor Information (Income and Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	$ 0	$ 0	$ 0	$ 0
Sales - third party	137,245	111,590	358,298	322,530
Net sales	137,245	111,590	358,298	322,530
Cost of sales	120,420	113,602	329,200	331,297
Lower of cost or market inventory adjustment	264	4,898	1,773	19,523
Gross profit	16,561	(6,910)	27,325	(28,290)
Research and development	1,338	526	3,110	1,964
Selling and administrative expenses	13,322	12,215	37,200	39,430
Operating loss	1,901	(19,651)	(12,985)	(69,684)
Other expense (income), net	(643)	(567)	3,610	(1,528)
Interest expense - affiliate	0	0	0	0
Interest expense - third party	7,792	6,964	23,240	19,860
Interest income - affiliate	0	0	0	0
Interest income - third party	58	158	320	169
Income (Loss) from continuing operations before provision for income taxes	(5,190)	(25,890)	(39,515)	(87,847)
Provision for income taxes	1,963	(1,789)	3,249	(7,675)
Equity in loss from continuing operations of subsidiary	0	0	0	0
Net (loss) income from continuing operations	(7,153)	(24,101)	(42,764)	(80,172)
Income (loss) from discontinued operations, net of tax	3,234	1,134	(4,882)	(107,568)
Equity in loss from discontinued operations of subsidiary	0	0	0	0
Net (loss) income from discontinued operations	3,234	1,134	(4,882)	(107,568)
Net loss	(3,919)	(22,967)	(47,646)	(187,740)
Statements of Comprehensive Income
Net loss	(3,919)	(22,967)	(47,646)	(187,740)
Other comprehensive income	7,546	2,418	21,141	14,119
Comprehensive loss	3,627	(20,549)	(26,505)	(173,621)
Consolidating Entries and Eliminations
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	(45,728)	(26,412)	(117,233)	(141,273)
Sales - third party	0	0	0	0
Net sales	(45,728)	(26,412)	(117,233)	(141,273)
Cost of sales	(45,728)	(26,412)	(117,233)	(141,273)
Lower of cost or market inventory adjustment	0	0	0	0
Gross profit	0	0	0	0
Research and development	0	0	0	0
Selling and administrative expenses	0	0	0	0
Operating loss	0	0	0	0
Other expense (income), net	0	0	0	0
Interest expense - affiliate	(916)	(268)	(2,363)	(702)
Interest expense - third party	0	0	0	0
Interest income - affiliate	916	268	2,363	702
Interest income - third party	0		0	0
Income (Loss) from continuing operations before provision for income taxes	0	0	0	0
Provision for income taxes	0	0	0	0
Equity in loss from continuing operations of subsidiary	(7,888)	29,319	22,569	115,928
Net (loss) income from continuing operations	(7,888)	29,319	22,569	115,928
Income (loss) from discontinued operations, net of tax	0	0	0	0
Equity in loss from discontinued operations of subsidiary	1,169	(1,310)	9,775	110,764
Net (loss) income from discontinued operations	1,169	(1,310)	9,775	110,764
Net loss	(6,719)	28,009	32,344	226,692
Statements of Comprehensive Income
Net loss	(6,719)	28,009	32,344	226,692
Other comprehensive income	(15,092)	(4,836)	(42,282)	(28,238)
Comprehensive loss	(21,811)	23,173	(9,938)	198,454
Parent
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	0	0	0	0
Sales - third party	0	0	0	0
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Lower of cost or market inventory adjustment	0	0	0	0
Gross profit	0	0	0	0
Research and development	0	0	0	0
Selling and administrative expenses	0	0	0	0
Operating loss	0	0	0	0
Other expense (income), net	1	0	7	6
Interest expense - affiliate	916	268	2,363	702
Interest expense - third party	6,399	6,362	19,170	19,059
Interest income - affiliate	0	0	0	0
Interest income - third party	0		0	0
Income (Loss) from continuing operations before provision for income taxes	(7,316)	(6,630)	(21,540)	(19,767)
Provision for income taxes	0	0	0	0
Equity in loss from continuing operations of subsidiary	163	(17,471)	(21,224)	(60,405)
Net (loss) income from continuing operations	(7,153)	(24,101)	(42,764)	(80,172)
Income (loss) from discontinued operations, net of tax	0	0	77	0
Equity in loss from discontinued operations of subsidiary	3,234	1,134	(4,959)	(107,568)
Net (loss) income from discontinued operations	3,234	1,134	(4,882)	(107,568)
Net loss	(3,919)	(22,967)	(47,646)	(187,740)
Statements of Comprehensive Income
Net loss	(3,919)	(22,967)	(47,646)	(187,740)
Other comprehensive income	7,546	2,418	21,141	14,119
Comprehensive loss	3,627	(20,549)	(26,505)	(173,621)
Guarantors
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	23,063	16,334	69,860	95,471
Sales - third party	32,617	21,891	76,980	64,534
Net sales	55,680	38,225	146,840	160,005
Cost of sales	58,380	36,886	150,164	142,299
Lower of cost or market inventory adjustment	0	1,915	934	5,697
Gross profit	(2,700)	(576)	(4,258)	12,009
Research and development	1,338	526	3,110	1,964
Selling and administrative expenses	3,471	3,906	10,740	13,695
Operating loss	(7,509)	(5,008)	(18,108)	(3,650)
Other expense (income), net	229	287	665	1,029
Interest expense - affiliate	0	0	0	0
Interest expense - third party	1,264	473	3,739	527
Interest income - affiliate	(916)	(268)	(2,363)	(702)
Interest income - third party	0		0	0
Income (Loss) from continuing operations before provision for income taxes	(8,086)	(5,500)	(20,149)	(4,504)
Provision for income taxes	(524)	123	(270)	378
Equity in loss from continuing operations of subsidiary	7,725	(11,848)	(1,345)	(55,523)
Net (loss) income from continuing operations	163	(17,471)	(21,224)	(60,405)
Income (loss) from discontinued operations, net of tax	7,637	958	(143)	(104,372)
Equity in loss from discontinued operations of subsidiary	(4,403)	176	(4,816)	(3,196)
Net (loss) income from discontinued operations	3,234	1,134	(4,959)	(107,568)
Net loss	3,397	(16,337)	(26,183)	(167,973)
Statements of Comprehensive Income
Net loss	3,397	(16,337)	(26,183)	(167,973)
Other comprehensive income	7,546	2,418	21,141	14,119
Comprehensive loss	10,943	(13,919)	(5,042)	(153,854)
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	22,665	10,078	47,373	45,802
Sales - third party	104,628	89,699	281,318	257,996
Net sales	127,293	99,777	328,691	303,798
Cost of sales	107,768	103,128	296,269	330,271
Lower of cost or market inventory adjustment	264	2,983	839	13,826
Gross profit	19,261	(6,334)	31,583	(40,299)
Research and development	0	0	0	0
Selling and administrative expenses	9,851	8,309	26,460	25,735
Operating loss	9,410	(14,643)	5,123	(66,034)
Other expense (income), net	(873)	(854)	2,938	(2,563)
Interest expense - affiliate	0	0	0	0
Interest expense - third party	129	129	331	274
Interest income - affiliate		0	0	0
Interest income - third party	58		320	169
Income (Loss) from continuing operations before provision for income taxes	10,212	(13,760)	2,174	(63,576)
Provision for income taxes	2,487	(1,912)	3,519	(8,053)
Equity in loss from continuing operations of subsidiary	0	0	0	0
Net (loss) income from continuing operations	7,725	(11,848)	(1,345)	(55,523)
Income (loss) from discontinued operations, net of tax	(4,403)	176	(4,816)	(3,196)
Equity in loss from discontinued operations of subsidiary	0	0	0	0
Net (loss) income from discontinued operations	(4,403)	176	(4,816)	(3,196)
Net loss	3,322	(11,672)	(6,161)	(58,719)
Statements of Comprehensive Income
Net loss	3,322	(11,672)	(6,161)	(58,719)
Other comprehensive income	7,546	2,418	21,141	14,119
Comprehensive loss	$ 10,868	$ (9,254)	$ 14,980	$ (44,600)

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investment Income, Interest, Related Party

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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