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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)