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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