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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 301,111 | $ 428,018 | $ 871,771 | $ 1,517,428
Third-party customers | 32,539 | 26,522 | 107,487 | 48,514
Total net sales | 333,650 | 454,540 | 979,258 | 1,565,942
Cost of goods sold | 351,262 | 496,963 | 995,357 | 1,505,928
Gross profit (loss) | (17,612) | (42,423) | (16,099) | 60,014
Selling, general and administrative expenses | 9,733 | 11,566 | 29,303 | 33,549
Ravenswood charges | 26,830 | 0 | 26,830 | 30,850
Other operating expense - net | 878 | 1,537 | 2,337 | 6,217
Operating loss | (55,053) | (55,526) | (74,569) | (10,602)
Interest expense - third parties | (5,531) | (5,418) | (16,521) | (16,542)
Interest income (expense) - affiliates | 0 | 0 | 0 | 0
Interest income - third parties | 190 | 45 | 475 | 248
Net gain on forward and derivative contracts | 1,275 | 285 | 2,998 | 1,204
Unrealized gain on fair value of contingent consideration | 0 | 1,523 | 0 | 18,337
Other income (expense) - net | (157) | 114 | (462) | 1,261
Loss before income taxes and equity in earnings of joint ventures | (59,276) | (58,977) | (88,079) | (6,094)
Income tax effect | 848 | 2,161 | 3,237 | (12,205)
Loss before equity in earnings of joint ventures | (58,428) | (56,816) | (84,842) | (18,299)
Equity in earnings (loss) of joint ventures | 155 | 704 | 891 | 2,069
Net loss | (58,273) | (56,112) | (83,951) | (16,230)
Other comprehensive income (loss) before income tax effect | 1,206 | (3,241) | 3,618 | 16,964
Income tax effect | (382) | (383) | (1,147) | (1,148)
Other comprehensive income (loss) | 824 | (3,624) | 2,471 | 15,816
Total comprehensive loss | (57,449) | (59,736) | (81,480) | (414)
Consolidating Adjustments [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | (22,285) | (27,176) | (69,596) | (41,617)
Third-party customers | (267) | (224) | (267) | (224)
Total net sales | (22,552) | (27,400) | (69,863) | (41,841)
Cost of goods sold | (21,777) | (11,058) | (69,552) | (28,468)
Gross profit (loss) | (775) | (16,342) | (311) | (13,373)
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Ravenswood charges | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating loss | (775) | (16,342) | (311) | (13,373)
Interest expense - third parties | 0 | 0 | 0 | 0
Interest income (expense) - affiliates | 0 | 0 | 0 | 0
Interest income - third parties | 0 | 0 | 0 | 0
Net gain on forward and derivative contracts | 0 | 0 | 0 | 0
Unrealized gain on fair value of contingent consideration |  | 0 |  | 0
Other income (expense) - net | 0 | 0 | 0 | (1,730)
Loss before income taxes and equity in earnings of joint ventures | (775) | (16,342) | (311) | (15,103)
Income tax effect | 0 | 163 | 0 | 0
Loss before equity in earnings of joint ventures | (775) | (16,179) | (311) | (15,103)
Equity in earnings (loss) of joint ventures | 52,806 | 66,088 | 73,241 | 12,621
Net loss | 52,031 | 49,909 | 72,930 | (2,482)
Other comprehensive income (loss) before income tax effect | (1,080) | 4,614 | (3,242) | (10,168)
Income tax effect | (8) | (8) | (25) | (25)
Other comprehensive income (loss) | (1,088) | 4,606 | (3,267) | (10,193)
Total comprehensive loss | 50,943 | 54,515 | 69,663 | (12,675)
The Company [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0 | 14,136 | 0 | 14,136
Third-party customers | 0 | 0 | 0 | 0
Total net sales | 0 | 14,136 | 0 | 14,136
Cost of goods sold | 0 | 0 | 0 | 0
Gross profit (loss) | 0 | 14,136 | 0 | 14,136
Selling, general and administrative expenses | 9,517 | 10,375 | 26,077 | 30,743
Ravenswood charges | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating loss | (9,517) | 3,761 | (26,077) | (16,607)
Interest expense - third parties | (5,101) | (4,980) | (15,236) | (15,217)
Interest income (expense) - affiliates | 9,947 | 9,163 | 29,222 | 28,242
Interest income - third parties | 33 | 15 | 108 | 48
Net gain on forward and derivative contracts | 0 | (177) | 0 | 0
Unrealized gain on fair value of contingent consideration |  | 0 |  | 0
Other income (expense) - net | 48 | 164 | 682 | 1,083
Loss before income taxes and equity in earnings of joint ventures | (4,590) | 7,946 | (11,301) | (2,451)
Income tax effect | (877) | 2,030 | 591 | (1,158)
Loss before equity in earnings of joint ventures | (5,467) | 9,976 | (10,710) | (3,609)
Equity in earnings (loss) of joint ventures | (52,806) | (66,088) | (73,241) | (12,621)
Net loss | (58,273) | (56,112) | (83,951) | (16,230)
Other comprehensive income (loss) before income tax effect | 1,206 | (3,241) | 3,618 | 16,964
Income tax effect | (382) | (383) | (1,147) | (1,148)
Other comprehensive income (loss) | 824 | (3,624) | 2,471 | 15,816
Total comprehensive loss | $ (57,449) | (59,736) | $ (81,480) | (414)
Combined Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 170,947 | 284,891 | $ 502,707 | 1,052,963
Third-party customers | 32,795 | 26,728 | 107,725 | 48,702
Total net sales | 203,742 | 311,619 | 610,432 | 1,101,665
Cost of goods sold | 231,082 | 359,072 | 653,258 | 1,107,955
Gross profit (loss) | (27,340) | (47,453) | (42,826) | (6,290)
Selling, general and administrative expenses | 0 | 59 | 0 | (115)
Ravenswood charges | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating loss | (27,340) | (47,512) | (42,826) | (6,175)
Interest expense - third parties | (385) | (391) | (1,150) | (1,186)
Interest income (expense) - affiliates | 2,059 | 1,901 | 6,013 | 5,531
Interest income - third parties | 0 | 0 | 9 | 4
Net gain on forward and derivative contracts | 1,275 | 353 | 2,998 | 1,059
Unrealized gain on fair value of contingent consideration |  | 1,523 |  | 18,337
Other income (expense) - net | 14 | 92 | 29 | (97)
Loss before income taxes and equity in earnings of joint ventures | (24,377) | (44,034) | (34,927) | 17,473
Income tax effect | 0 | 0 | 0 | 0
Loss before equity in earnings of joint ventures | (24,377) | (44,034) | (34,927) | 17,473
Equity in earnings (loss) of joint ventures | 0 | 0 | 0 | 0
Net loss | (24,377) | (44,034) | (34,927) | 17,473
Other comprehensive income (loss) before income tax effect | 777 | 212 | 2,332 | 13,034
Income tax effect | 0 | 0 | 0 | 0
Other comprehensive income (loss) | 777 | 212 | 2,332 | 13,034
Total comprehensive loss | (23,600) | (43,822) | (32,595) | 30,507
Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 152,449 | 156,167 | 438,660 | 491,946
Third-party customers | 11 | 18 | 29 | 36
Total net sales | 152,460 | 156,185 | 438,689 | 491,982
Cost of goods sold | 141,957 | 148,949 | 411,651 | 426,441
Gross profit (loss) | 10,503 | 7,236 | 27,038 | 65,541
Selling, general and administrative expenses | 216 | 1,132 | 3,226 | 2,921
Ravenswood charges | 26,830 | 0 | 26,830 | 30,850
Other operating expense - net | 878 | 1,537 | 2,337 | 6,217
Operating loss | (17,421) | 4,567 | (5,355) | 25,553
Interest expense - third parties | (45) | (47) | (135) | (139)
Interest income (expense) - affiliates | (12,006) | (11,064) | (35,235) | (33,773)
Interest income - third parties | 157 | 30 | 358 | 196
Net gain on forward and derivative contracts | 0 | 109 | 0 | 145
Unrealized gain on fair value of contingent consideration |  | 0 |  | 0
Other income (expense) - net | (219) | (142) | (1,173) | 2,005
Loss before income taxes and equity in earnings of joint ventures | (29,534) | (6,547) | (41,540) | (6,013)
Income tax effect | 1,725 | (32) | 2,646 | (11,047)
Loss before equity in earnings of joint ventures | (27,809) | (6,579) | (38,894) | (17,060)
Equity in earnings (loss) of joint ventures | 155 | 704 | 891 | 2,069
Net loss | (27,654) | (5,875) | (38,003) | (14,991)
Other comprehensive income (loss) before income tax effect | 303 | (4,826) | 910 | (2,866)
Income tax effect | 8 | 8 | 25 | 25
Other comprehensive income (loss) | 311 | (4,818) | 935 | (2,841)
Total comprehensive loss | $ (27,343) | $ (10,693) | $ (37,068) | $ (17,832)

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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