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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 290,283 | $ 513,681 | $ 570,660 | $ 1,089,410
Third-party customers | 36,471 | 9,810 | 74,948 | 21,992
Total net sales | 326,754 | 523,491 | 645,608 | 1,111,402
Cost of goods sold | 321,172 | 515,149 | 643,078 | 1,008,965
Gross profit | 5,582 | 8,342 | 2,530 | 102,437
Selling, general and administrative expenses | 9,945 | 10,012 | 19,570 | 21,983
Ravenswood impairment | 0 | 30,850 | 0 | 30,850
Other operating expense - net | 578 | 2,601 | 1,459 | 4,680
Operating income (loss) | (4,941) | (35,121) | (18,499) | 44,924
Interest expense - third parties | (5,497) | (5,573) | (10,990) | (11,124)
Interest income (expense) - affiliates | 0 | 0 | 0 | 0
Interest income - third parties | 171 | 61 | 285 | 203
Net gain on forward and derivative contracts | 353 | 566 | 706 | 919
Unrealized gain on fair value of contingent consideration | 0 | 10,287 | 0 | 16,814
Other income (expense) - net | (299) | 93 | (305) | 1,147
Income (loss) before income taxes and equity in earnings of joint ventures | (10,213) | (29,687) | (28,803) | 52,883
Income tax benefit (expense) | 319 | (5,065) | 2,389 | (14,366)
Income (loss) before equity in earnings of joint ventures | (9,894) | (34,752) | (26,414) | 38,517
Equity in earnings (loss) of joint ventures | 379 | 855 | 736 | 1,365
Net income (loss) | (9,515) | (33,897) | (25,678) | 39,882
Other comprehensive income before income tax effect | 1,206 | 19,744 | 2,412 | 20,205
Income tax effect | (382) | (382) | (765) | (765)
Other comprehensive income | 824 | 19,362 | 1,647 | 19,440
Total comprehensive income (loss) | (8,691) | (14,535) | (24,031) | 59,322
Consolidating Adjustments [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | (23,914) | (13,327) | (47,311) | (14,441)
Third-party customers | 0 | 698 | 0 | 0
Total net sales | (23,914) | (12,629) | (47,311) | (14,441)
Cost of goods sold | (23,804) | (12,896) | (47,775) | (17,410)
Gross profit | (110) | 267 | 464 | 2,969
Selling, general and administrative expenses | 0 | (1,000) | 0 | 0
Ravenswood impairment |  | 0 |  | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | (110) | 1,267 | 464 | 2,969
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)
Income (loss) before income taxes and equity in earnings of joint ventures | (110) | 1,267 | 464 | 1,239
Income tax benefit (expense) | 0 | (213) | 0 | (163)
Income (loss) before equity in earnings of joint ventures | (110) | 1,054 | 464 | 1,076
Equity in earnings (loss) of joint ventures | 6,660 | 25,779 | 20,435 | (53,467)
Net income (loss) | 6,550 | 26,833 | 20,899 | (52,391)
Other comprehensive income before income tax effect | (1,081) | (14,504) | (2,162) | (14,782)
Income tax effect | (9) | (9) | (17) | (17)
Other comprehensive income | (1,090) | (14,513) | (2,179) | (14,799)
Total comprehensive income (loss) | 5,460 | 12,320 | 18,720 | (67,190)
The Company [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0 | 0 | 0 | 0
Third-party customers | 0 | 0 | 0 | 0
Total net sales | 0 | 0 | 0 | 0
Cost of goods sold | 0 | 0 | 0 | 0
Gross profit | 0 | 0 | 0 | 0
Selling, general and administrative expenses | 8,261 | 9,531 | 16,560 | 20,368
Ravenswood impairment |  | 0 |  | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | (8,261) | (9,531) | (16,560) | (20,368)
Interest expense - third parties | (5,070) | (5,128) | (10,135) | (10,237)
Interest income (expense) - affiliates | 9,727 | 8,853 | 19,275 | 19,079
Interest income - third parties | 38 | 18 | 75 | 33
Net gain on forward and derivative contracts | 0 | 177 | 0 | 177
Unrealized gain on fair value of contingent consideration |  | 0 |  | 0
Other income (expense) - net | (137) | 382 | 634 | 919
Income (loss) before income taxes and equity in earnings of joint ventures | (3,703) | (5,229) | (6,711) | (10,397)
Income tax benefit (expense) | 848 | (2,889) | 1,468 | (3,188)
Income (loss) before equity in earnings of joint ventures | (2,855) | (8,118) | (5,243) | (13,585)
Equity in earnings (loss) of joint ventures | (6,660) | (25,779) | (20,435) | 53,467
Net income (loss) | (9,515) | (33,897) | (25,678) | 39,882
Other comprehensive income before income tax effect | 1,206 | 19,744 | 2,412 | 20,205
Income tax effect | (382) | (382) | (765) | (765)
Other comprehensive income | 824 | 19,362 | 1,647 | 19,440
Total comprehensive income (loss) | $ (8,691) | (14,535) | $ (24,031) | 59,322
Combined Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 169,640 | 365,008 | $ 331,760 | 768,072
Third-party customers | 36,462 | 9,100 | 74,930 | 21,974
Total net sales | 206,102 | 374,108 | 406,690 | 790,046
Cost of goods sold | 211,586 | 386,581 | 421,159 | 748,883
Gross profit | (5,484) | (12,473) | (14,469) | 41,163
Selling, general and administrative expenses | 0 | 770 | 0 | (174)
Ravenswood impairment |  | 0 |  | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | (5,484) | (13,243) | (14,469) | 41,337
Interest expense - third parties | (383) | (399) | (765) | (795)
Interest income (expense) - affiliates | 1,997 | 1,843 | 3,954 | 3,630
Interest income - third parties | 9 | 0 | 9 | 4
Net gain on forward and derivative contracts | 353 | 353 | 706 | 706
Unrealized gain on fair value of contingent consideration |  | 10,287 |  | 16,814
Other income (expense) - net | 21 | 295 | 15 | (189)
Income (loss) before income taxes and equity in earnings of joint ventures | (3,487) | (864) | (10,550) | 61,507
Income tax benefit (expense) | 0 | 0 | 0 | 0
Income (loss) before equity in earnings of joint ventures | (3,487) | (864) | (10,550) | 61,507
Equity in earnings (loss) of joint ventures | 0 | 0 | 0 | 0
Net income (loss) | (3,487) | (864) | (10,550) | 61,507
Other comprehensive income before income tax effect | 777 | 12,789 | 1,555 | 12,822
Income tax effect | 0 | 0 | 0 | 0
Other comprehensive income | 777 | 12,789 | 1,555 | 12,822
Total comprehensive income (loss) | (2,710) | 11,925 | (8,995) | 74,329
Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 144,557 | 162,000 | 286,211 | 335,779
Third-party customers | 9 | 12 | 18 | 18
Total net sales | 144,566 | 162,012 | 286,229 | 335,797
Cost of goods sold | 133,390 | 141,464 | 269,694 | 277,492
Gross profit | 11,176 | 20,548 | 16,535 | 58,305
Selling, general and administrative expenses | 1,684 | 711 | 3,010 | 1,789
Ravenswood impairment |  | 30,850 |  | 30,850
Other operating expense - net | 578 | 2,601 | 1,459 | 4,680
Operating income (loss) | 8,914 | (13,614) | 12,066 | 20,986
Interest expense - third parties | (44) | (46) | (90) | (92)
Interest income (expense) - affiliates | (11,724) | (10,696) | (23,229) | (22,709)
Interest income - third parties | 124 | 43 | 201 | 166
Net gain on forward and derivative contracts | 0 | 36 | 0 | 36
Unrealized gain on fair value of contingent consideration |  | 0 |  | 0
Other income (expense) - net | (183) | (584) | (954) | 2,147
Income (loss) before income taxes and equity in earnings of joint ventures | (2,913) | (24,861) | (12,006) | 534
Income tax benefit (expense) | (529) | (1,963) | 921 | (11,015)
Income (loss) before equity in earnings of joint ventures | (3,442) | (26,824) | (11,085) | (10,481)
Equity in earnings (loss) of joint ventures | 379 | 855 | 736 | 1,365
Net income (loss) | (3,063) | (25,969) | (10,349) | (9,116)
Other comprehensive income before income tax effect | 304 | 1,715 | 607 | 1,960
Income tax effect | 9 | 9 | 17 | 17
Other comprehensive income | 313 | 1,724 | 624 | 1,977
Total comprehensive income (loss) | $ (2,750) | $ (24,245) | $ (9,725) | $ (7,139)

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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 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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