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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Revenue, Net [Abstract] |  |
Related parties | $ 280,377 | $ 575,729
Third-party customers | 38,477 | 12,182
Total net sales | 318,854 | 587,911
Cost of goods sold | 321,906 | 493,816
Gross profit (loss) | (3,052) | 94,095
Selling, general and administrative expenses | 9,625 | 11,971
Other operating expense - net | 881 | 2,079
Operating income (loss) | (13,558) | 80,045
Interest expense - third parties | (5,493) | (5,551)
Interest income (expense) - affiliates | 0 | 0
Interest income - third parties | 114 | 142
Net gain on forward and derivative contracts | 353 | 353
Unrealized gain on fair value of contingent consideration | 0 | 6,527
Other income (expense) - net | (6) | 1,054
Income (loss) before income taxes and equity in earnings of joint ventures | (18,590) | 82,570
Income tax benefit | 2,070 | (9,301)
Income (loss) before equity in earnings of joint ventures | (16,520) | 73,269
Equity in earnings (loss) of joint ventures | 357 | 510
Net income (loss) | (16,163) | 73,779
Other comprehensive income before income tax effect | 1,206 | 461
Income tax effect | (383) | (383)
Other comprehensive income | 823 | 78
Total comprehensive income (loss) | (15,340) | 73,857
Consolidating Adjustments [Member] |  |
Revenue, Net [Abstract] |  |
Related parties | (23,397) | (1,114)
Third-party customers | 0 | (698)
Total net sales | (23,397) | (1,812)
Cost of goods sold | (23,971) | (4,514)
Gross profit (loss) | 574 | 2,702
Selling, general and administrative expenses | 0 | 1,000
Other operating expense - net | 0 | 0
Operating income (loss) | 574 | 1,702
Interest expense - third parties | 0 | 0
Interest income (expense) - affiliates | 0 | 0
Interest income - third parties | 0 | 0
Net gain on forward and derivative contracts | 0 | 0
Unrealized gain on fair value of contingent consideration |  | 0
Other income (expense) - net | 0 | (1,730)
Income (loss) before income taxes and equity in earnings of joint ventures | 574 | (28)
Income tax benefit | 0 | 50
Income (loss) before equity in earnings of joint ventures | 574 | 22
Equity in earnings (loss) of joint ventures | 13,775 | (79,246)
Net income (loss) | 14,349 | (79,224)
Other comprehensive income before income tax effect | (1,081) | (278)
Income tax effect | (8) | (8)
Other comprehensive income | (1,089) | (286)
Total comprehensive income (loss) | 13,260 | (79,510)
The Company [Member] |  |
Revenue, Net [Abstract] |  |
Related parties | 0 | 0
Third-party customers | 0 | 0
Total net sales | 0 | 0
Cost of goods sold | 0 | 0
Gross profit (loss) | 0 | 0
Selling, general and administrative expenses | 8,299 | 10,837
Other operating expense - net | 0 | 0
Operating income (loss) | (8,299) | (10,837)
Interest expense - third parties | (5,065) | (5,109)
Interest income (expense) - affiliates | 9,548 | 10,226
Interest income - third parties | 37 | 15
Net gain on forward and derivative contracts | 0 | 0
Unrealized gain on fair value of contingent consideration |  | 0
Other income (expense) - net | 771 | 537
Income (loss) before income taxes and equity in earnings of joint ventures | (3,008) | (5,168)
Income tax benefit | 620 | (299)
Income (loss) before equity in earnings of joint ventures | (2,388) | (5,467)
Equity in earnings (loss) of joint ventures | (13,775) | 79,246
Net income (loss) | (16,163) | 73,779
Other comprehensive income before income tax effect | 1,206 | 461
Income tax effect | (383) | (383)
Other comprehensive income | 823 | 78
Total comprehensive income (loss) | $ (15,340) | 73,857
Combined Guarantor Subsidiaries [Member] |  |
Condensed Statement of Income Captions [Line Items] |  |
Ownership percentage | 100.00% |
Revenue, Net [Abstract] |  |
Related parties | $ 162,120 | 403,064
Third-party customers | 38,468 | 12,874
Total net sales | 200,588 | 415,938
Cost of goods sold | 209,573 | 362,302
Gross profit (loss) | (8,985) | 53,636
Selling, general and administrative expenses | 0 | (944)
Other operating expense - net | 0 | 0
Operating income (loss) | (8,985) | 54,580
Interest expense - third parties | (382) | (396)
Interest income (expense) - affiliates | 0 | 0
Interest income - third parties | 0 | 4
Net gain on forward and derivative contracts | 353 | 353
Unrealized gain on fair value of contingent consideration |  | 6,527
Other income (expense) - net | (6) | (484)
Income (loss) before income taxes and equity in earnings of joint ventures | (9,020) | 60,584
Income tax benefit | 0 | 0
Income (loss) before equity in earnings of joint ventures | (9,020) | 60,584
Equity in earnings (loss) of joint ventures | 0 | 0
Net income (loss) | (9,020) | 60,584
Other comprehensive income before income tax effect | 778 | 33
Income tax effect | 0 | 0
Other comprehensive income | 778 | 33
Total comprehensive income (loss) | (8,242) | 60,617
Combined Non-Guarantor Subsidiaries [Member] |  |
Revenue, Net [Abstract] |  |
Related parties | 141,654 | 173,779
Third-party customers | 9 | 6
Total net sales | 141,663 | 173,785
Cost of goods sold | 136,304 | 136,028
Gross profit (loss) | 5,359 | 37,757
Selling, general and administrative expenses | 1,326 | 1,078
Other operating expense - net | 881 | 2,079
Operating income (loss) | 3,152 | 34,600
Interest expense - third parties | (46) | (46)
Interest income (expense) - affiliates | (9,548) | (10,226)
Interest income - third parties | 77 | 123
Net gain on forward and derivative contracts | 0 | 0
Unrealized gain on fair value of contingent consideration |  | 0
Other income (expense) - net | (771) | 2,731
Income (loss) before income taxes and equity in earnings of joint ventures | (7,136) | 27,182
Income tax benefit | 1,450 | (9,052)
Income (loss) before equity in earnings of joint ventures | (5,686) | 18,130
Equity in earnings (loss) of joint ventures | 357 | 510
Net income (loss) | (5,329) | 18,640
Other comprehensive income before income tax effect | 303 | 245
Income tax effect | 8 | 8
Other comprehensive income | 311 | 253
Total comprehensive income (loss) | $ (5,018) | $ 18,893

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