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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 296,271 | $ 290,283 | $ 576,844 | $ 570,660
Other customers | 92,531 | 36,471 | 177,744 | 74,948
Total net sales | 388,802 | 326,754 | 754,588 | 645,608
Cost of goods sold | 366,342 | 321,172 | 715,277 | 643,078
Gross profit | 22,460 | 5,582 | 39,311 | 2,530
Selling, general and administrative expenses | 9,352 | 9,945 | 20,054 | 19,570
Other operating expense - net | 180 | 578 | 1,153 | 1,459
Operating income (loss) | 12,928 | (4,941) | 18,104 | (18,499)
Interest expense | (5,461) | (5,497) | (11,032) | (10,990)
Intercompany interest | 0 | 0 | 0 | 0
Interest income | 283 | 171 | 513 | 285
Net gain on forward and derivative contracts | 2,957 | 353 | (13,180) | 706
Other (expense) - net | (1,876) | (299) | (1,492) | (305)
Income (loss) before income taxes and equity in earnings of joint ventures | 8,831 | (10,213) | (7,087) | (28,803)
Income tax (expense) benefit | (1,452) | 319 | (1,144) | 2,389
Income (loss) before equity in earnings of joint ventures | 7,379 | (9,894) | (8,231) | (26,414)
Equity in earnings (loss) of joint ventures | (248) | 379 | 223 | 736
Net income (loss) | 7,131 | (9,515) | (8,008) | (25,678)
Other comprehensive income (loss) before income tax effect | (142) | 1,206 | 1,644 | 2,412
Income tax effect | 311 | (382) | (763) | (765)
Other comprehensive income | 169 | 824 | 881 | 1,647
Total comprehensive income (loss) | 7,300 | (8,691) | (7,127) | (24,031)
Consolidating Adjustments [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0 | (23,914) | 0 | (47,311)
Other customers | 0 | 0 | 0 | 0
Total net sales | 0 | (23,914) | 0 | (47,311)
Cost of goods sold | 0 | (23,804) | 0 | (47,775)
Gross profit | 0 | (110) | 0 | 464
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | 0 | (110) | 0 | 464
Interest expense | 0 | 0 | 0 | 0
Intercompany interest | 0 | 0 |  | 0
Interest income | 0 | 0 | 0 | 0
Net gain on forward and derivative contracts | 0 | 0 | 0 | 0
Other (expense) - net | 0 | 0 | 0 | 0
Income (loss) before income taxes and equity in earnings of joint ventures | 0 | (110) | 0 | 464
Income tax (expense) benefit | 0 | 0 | 0 | 0
Income (loss) before equity in earnings of joint ventures | 0 | (110) | 0 | 464
Equity in earnings (loss) of joint ventures | (13,066) | 6,660 | (3,708) | 20,435
Net income (loss) | (13,066) | 6,550 | (3,708) | 20,899
Other comprehensive income (loss) before income tax effect | 986 | (1,081) | (668) | (2,162)
Income tax effect | (11) | (9) | (19) | (17)
Other comprehensive income | 975 | (1,090) | (687) | (2,179)
Total comprehensive income (loss) | (12,091) | 5,460 | (4,395) | 18,720
The Company [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 | 0 | 0 | 0 | 0
Selling, general and administrative expenses | 8,914 | 8,261 | 19,114 | 16,560
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | (8,914) | (8,261) | (19,114) | (16,560)
Interest expense | (5,035) | (5,070) | (10,183) | (10,135)
Intercompany interest | 9,213 | 9,727 | 18,195 | 19,275
Interest income | 49 | 38 | 129 | 75
Net gain on forward and derivative contracts | 0 | 0 | 0 | 0
Other (expense) - net | (110) | (137) | 677 | 634
Income (loss) before income taxes and equity in earnings of joint ventures | (4,797) | (3,703) | (10,296) | (6,711)
Income tax (expense) benefit | 529 | 848 | 1,100 | 1,468
Income (loss) before equity in earnings of joint ventures | (4,268) | (2,855) | (9,196) | (5,243)
Equity in earnings (loss) of joint ventures | 11,399 | (6,660) | 1,188 | (20,435)
Net income (loss) | 7,131 | (9,515) | (8,008) | (25,678)
Other comprehensive income (loss) before income tax effect | (142) | 1,206 | 1,644 | 2,412
Income tax effect | 311 | (382) | (763) | (765)
Other comprehensive income | 169 | 824 | 881 | 1,647
Total comprehensive income (loss) | $ 7,300 | (8,691) | $ (7,127) | (24,031)
Combined Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 134,850 | 169,640 | $ 265,918 | 331,760
Other customers | 92,496 | 36,462 | 177,679 | 74,930
Total net sales | 227,346 | 206,102 | 443,597 | 406,690
Cost of goods sold | 220,553 | 211,586 | 434,304 | 421,159
Gross profit | 6,793 | (5,484) | 9,293 | (14,469)
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Other operating expense - net | 0 | 0 | 0 | 0
Operating income (loss) | 6,793 | (5,484) | 9,293 | (14,469)
Interest expense | (382) | (383) | (761) | (765)
Intercompany interest | 2,147 | 1,997 | 4,228 | 3,954
Interest income | (1) | 9 | (1) | 9
Net gain on forward and derivative contracts | 2,644 | 353 | (13,203) | 706
Other (expense) - net | 114 | 21 | 161 | 15
Income (loss) before income taxes and equity in earnings of joint ventures | 11,315 | (3,487) | (283) | (10,550)
Income tax (expense) benefit | (493) | 0 | 0 | 0
Income (loss) before equity in earnings of joint ventures | 10,822 | (3,487) | (283) | (10,550)
Equity in earnings (loss) of joint ventures | 1,667 | 0 | 2,520 | 0
Net income (loss) | 12,489 | (3,487) | 2,237 | (10,550)
Other comprehensive income (loss) before income tax effect | (1,467) | 777 | (161) | 1,555
Income tax effect | 0 | 0 | 0 | 0
Other comprehensive income | (1,467) | 777 | (161) | 1,555
Total comprehensive income (loss) | 11,022 | (2,710) | 2,076 | (8,995)
Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 161,421 | 144,557 | 310,926 | 286,211
Other customers | 35 | 9 | 65 | 18
Total net sales | 161,456 | 144,566 | 310,991 | 286,229
Cost of goods sold | 145,789 | 133,390 | 280,973 | 269,694
Gross profit | 15,667 | 11,176 | 30,018 | 16,535
Selling, general and administrative expenses | 438 | 1,684 | 940 | 3,010
Other operating expense - net | 180 | 578 | 1,153 | 1,459
Operating income (loss) | 15,049 | 8,914 | 27,925 | 12,066
Interest expense | (44) | (44) | (88) | (90)
Intercompany interest | (11,360) | (11,724) | (22,423) | (23,229)
Interest income | 235 | 124 | 385 | 201
Net gain on forward and derivative contracts | 313 | 0 | 23 | 0
Other (expense) - net | (1,880) | (183) | (2,330) | (954)
Income (loss) before income taxes and equity in earnings of joint ventures | 2,313 | (2,913) | 3,492 | (12,006)
Income tax (expense) benefit | (1,488) | (529) | (2,244) | 921
Income (loss) before equity in earnings of joint ventures | 825 | (3,442) | 1,248 | (11,085)
Equity in earnings (loss) of joint ventures | (248) | 379 | 223 | 736
Net income (loss) | 577 | (3,063) | 1,471 | (10,349)
Other comprehensive income (loss) before income tax effect | 481 | 304 | 829 | 607
Income tax effect | 11 | 9 | 19 | 17
Other comprehensive income | 492 | 313 | 848 | 624
Total comprehensive income (loss) | $ 1,069 | $ (2,750) | $ 2,319 | $ (9,725)

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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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