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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 299,235 | $ 301,111 | $ 876,079 | $ 871,771
Other customers | 101,410 | 32,539 | 279,154 | 107,487
Total net sales | 400,645 | 333,650 | 1,155,233 | 979,258
Cost of goods sold | 359,243 | 351,262 | 1,074,520 | 995,357
Gross profit (loss) | 41,402 | (17,612) | 80,713 | (16,099)
Selling, general and administrative expenses | 13,994 | 9,733 | 34,048 | 29,303
Ravenswood (gains) losses | (5,500) | 26,830 | (5,500) | 26,830
Other operating expense - net | 437 | 878 | 1,590 | 2,337
Operating income (loss) | 32,471 | (55,053) | 50,575 | (74,569)
Interest expense | (5,542) | (5,531) | (16,574) | (16,521)
Intercompany interest | 0 | 0 | 0 | 0
Interest income | 422 | 190 | 935 | 475
Net (loss) on forward and derivative contracts | (3,888) | 1,275 | (17,068) | 2,998
Other income (expense) - net | 427 | (157) | (1,065) | (462)
Income (loss) before income taxes and equity in earnings of joint ventures | 23,890 | (59,276) | 16,803 | (88,079)
Income tax (expense) benefit | (3,321) | 848 | (4,465) | 3,237
Income (loss) before equity in earnings of joint ventures | 20,569 | (58,428) | 12,338 | (84,842)
Equity in earnings (loss) of joint ventures | 214 | 155 | 437 | 891
Net income (loss) | 20,783 | (58,273) | 12,775 | (83,951)
Other comprehensive income (loss) before income tax effect | 1,429 | 1,206 | 3,073 | 3,618
Income tax effect | (382) | (382) | (1,145) | (1,147)
Other comprehensive income | 1,047 | 824 | 1,928 | 2,471
Total comprehensive income (loss) | 21,830 | (57,449) | 14,703 | (81,480)
Consolidating Adjustments [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0 | (22,285) | 0 | (69,596)
Other customers | 0 | (267) | 0 | (267)
Total net sales | 0 | (22,552) | 0 | (69,863)
Cost of goods sold | 0 | (21,777) | 0 | (69,552)
Gross profit (loss) | 0 | (775) | 0 | (311)
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Ravenswood (gains) losses | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | 0 | (775) | 0 | (311)
Interest expense | 0 | 0 | 0 | 0
Intercompany interest | 0 | 0 |  | 0
Interest income | 0 | 0 | 0 | 0
Net (loss) on forward and derivative contracts | 0 | 0 | 0 | 0
Other income (expense) - net | 0 | 0 | 0 | 0
Income (loss) before income taxes and equity in earnings of joint ventures | 0 | (775) | 0 | (311)
Income tax (expense) benefit | 0 | 0 | 0 | 0
Income (loss) before equity in earnings of joint ventures | 0 | (775) | 0 | (311)
Equity in earnings (loss) of joint ventures | (31,852) | 52,806 | (35,560) | 73,241
Net income (loss) | (31,852) | 52,031 | (35,560) | 72,930
Other comprehensive income (loss) before income tax effect | (1,319) | (1,080) | (1,987) | (3,242)
Income tax effect | (9) | (8) | (28) | (25)
Other comprehensive income | (1,328) | (1,088) | (2,015) | (3,267)
Total comprehensive income (loss) | (33,180) | 50,943 | (37,575) | 69,663
The Company [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0 | 0 | 0 | 0
Other customers | 0 | 0 | 0 | 0
Total net sales | 0 | 0 | 0 | 0
Cost of goods sold | 0 | 0 | 0 | 0
Gross profit (loss) | 0 | 0 | 0 | 0
Selling, general and administrative expenses | 13,684 | 9,517 | 32,798 | 26,077
Ravenswood (gains) losses | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | (13,684) | (9,517) | (32,798) | (26,077)
Interest expense | (5,105) | (5,101) | (15,288) | (15,236)
Intercompany interest | 8,909 | 9,947 | 27,104 | 29,222
Interest income | 183 | 33 | 312 | 108
Net (loss) on forward and derivative contracts | 0 | 0 | 0 | 0
Other income (expense) - net | 0 | 48 | 677 | 682
Income (loss) before income taxes and equity in earnings of joint ventures | (9,697) | (4,590) | (19,993) | (11,301)
Income tax (expense) benefit | (3) | (877) | 1,097 | 591
Income (loss) before equity in earnings of joint ventures | (9,700) | (5,467) | (18,896) | (10,710)
Equity in earnings (loss) of joint ventures | 30,483 | (52,806) | 31,671 | (73,241)
Net income (loss) | 20,783 | (58,273) | 12,775 | (83,951)
Other comprehensive income (loss) before income tax effect | 1,429 | 1,206 | 3,073 | 3,618
Income tax effect | (382) | (382) | (1,145) | (1,147)
Other comprehensive income | 1,047 | 824 | 1,928 | 2,471
Total comprehensive income (loss) | $ 21,830 | (57,449) | $ 14,703 | (81,480)
Combined Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 138,212 | 170,947 | $ 404,130 | 502,707
Other customers | 101,382 | 32,795 | 279,061 | 107,725
Total net sales | 239,594 | 203,742 | 683,191 | 610,432
Cost of goods sold | 220,723 | 231,082 | 655,027 | 653,258
Gross profit (loss) | 18,871 | (27,340) | 28,164 | (42,826)
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Ravenswood (gains) losses | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | 18,871 | (27,340) | 28,164 | (42,826)
Interest expense | (392) | (385) | (1,153) | (1,150)
Intercompany interest | 2,214 | 2,059 | 6,442 | 6,013
Interest income | 0 | 0 | (1) | 9
Net (loss) on forward and derivative contracts | (3,853) | 1,275 | (17,056) | 2,998
Other income (expense) - net | (56) | 14 | 105 | 29
Income (loss) before income taxes and equity in earnings of joint ventures | 16,784 | (24,377) | 16,501 | (34,927)
Income tax (expense) benefit | 0 | 0 | 0 | 0
Income (loss) before equity in earnings of joint ventures | 16,784 | (24,377) | 16,501 | (34,927)
Equity in earnings (loss) of joint ventures | 1,369 | 0 | 3,889 | 0
Net income (loss) | 18,153 | (24,377) | 20,390 | (34,927)
Other comprehensive income (loss) before income tax effect | 982 | 777 | 821 | 2,332
Income tax effect | 0 | 0 | 0 | 0
Other comprehensive income | 982 | 777 | 821 | 2,332
Total comprehensive income (loss) | 19,135 | (23,600) | 21,211 | (32,595)
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 161,023 | 152,449 | 471,949 | 438,660
Other customers | 28 | 11 | 93 | 29
Total net sales | 161,051 | 152,460 | 472,042 | 438,689
Cost of goods sold | 138,520 | 141,957 | 419,493 | 411,651
Gross profit (loss) | 22,531 | 10,503 | 52,549 | 27,038
Selling, general and administrative expenses | 310 | 216 | 1,250 | 3,226
Ravenswood (gains) losses | (5,500) | 26,830 | (5,500) | 26,830
Other operating expense - net | 437 | 878 | 1,590 | 2,337
Operating income (loss) | 27,284 | (17,421) | 55,209 | (5,355)
Interest expense | (45) | (45) | (133) | (135)
Intercompany interest | (11,123) | (12,006) | (33,546) | (35,235)
Interest income | 239 | 157 | 624 | 358
Net (loss) on forward and derivative contracts | (35) | 0 | (12) | 0
Other income (expense) - net | 483 | (219) | (1,847) | (1,173)
Income (loss) before income taxes and equity in earnings of joint ventures | 16,803 | (29,534) | 20,295 | (41,540)
Income tax (expense) benefit | (3,318) | 1,725 | (5,562) | 2,646
Income (loss) before equity in earnings of joint ventures | 13,485 | (27,809) | 14,733 | (38,894)
Equity in earnings (loss) of joint ventures | 214 | 155 | 437 | 891
Net income (loss) | 13,699 | (27,654) | 15,170 | (38,003)
Other comprehensive income (loss) before income tax effect | 337 | 303 | 1,166 | 910
Income tax effect | 9 | 8 | 28 | 25
Other comprehensive income | 346 | 311 | 1,194 | 935
Total comprehensive income (loss) | $ 14,045 | $ (27,343) | $ 16,364 | $ (37,068)

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and 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(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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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