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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue, Net [Abstract]        
Related parties $ 301,111 $ 428,018 $ 871,771 $ 1,517,428
Third-party customers 32,539 26,522 107,487 48,514
Total net sales 333,650 454,540 979,258 1,565,942
Cost of goods sold 351,262 496,963 995,357 1,505,928
Gross profit (loss) (17,612) (42,423) (16,099) 60,014
Selling, general and administrative expenses 9,733 11,566 29,303 33,549
Ravenswood charges 26,830 0 26,830 30,850
Other operating expense - net 878 1,537 2,337 6,217
Operating loss (55,053) (55,526) (74,569) (10,602)
Interest expense - third parties (5,531) (5,418) (16,521) (16,542)
Interest income (expense) - affiliates 0 0 0 0
Interest income - third parties 190 45 475 248
Net gain on forward and derivative contracts 1,275 285 2,998 1,204
Unrealized gain on fair value of contingent consideration 0 1,523 0 18,337
Other income (expense) - net (157) 114 (462) 1,261
Loss before income taxes and equity in earnings of joint ventures (59,276) (58,977) (88,079) (6,094)
Income tax effect 848 2,161 3,237 (12,205)
Loss before equity in earnings of joint ventures (58,428) (56,816) (84,842) (18,299)
Equity in earnings (loss) of joint ventures 155 704 891 2,069
Net loss (58,273) (56,112) (83,951) (16,230)
Other comprehensive income (loss) before income tax effect 1,206 (3,241) 3,618 16,964
Income tax effect (382) (383) (1,147) (1,148)
Other comprehensive income (loss) 824 (3,624) 2,471 15,816
Total comprehensive loss (57,449) (59,736) (81,480) (414)
Consolidating Adjustments [Member]        
Revenue, Net [Abstract]        
Related parties (22,285) (27,176) (69,596) (41,617)
Third-party customers (267) (224) (267) (224)
Total net sales (22,552) (27,400) (69,863) (41,841)
Cost of goods sold (21,777) (11,058) (69,552) (28,468)
Gross profit (loss) (775) (16,342) (311) (13,373)
Selling, general and administrative expenses 0 0 0 0
Ravenswood charges 0 0 0 0
Other operating expense - net 0 0 0 0
Operating loss (775) (16,342) (311) (13,373)
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)
Loss before income taxes and equity in earnings of joint ventures (775) (16,342) (311) (15,103)
Income tax effect 0 163 0 0
Loss before equity in earnings of joint ventures (775) (16,179) (311) (15,103)
Equity in earnings (loss) of joint ventures 52,806 66,088 73,241 12,621
Net loss 52,031 49,909 72,930 (2,482)
Other comprehensive income (loss) before income tax effect (1,080) 4,614 (3,242) (10,168)
Income tax effect (8) (8) (25) (25)
Other comprehensive income (loss) (1,088) 4,606 (3,267) (10,193)
Total comprehensive loss 50,943 54,515 69,663 (12,675)
The Company [Member]        
Revenue, Net [Abstract]        
Related parties 0 14,136 0 14,136
Third-party customers 0 0 0 0
Total net sales 0 14,136 0 14,136
Cost of goods sold 0 0 0 0
Gross profit (loss) 0 14,136 0 14,136
Selling, general and administrative expenses 9,517 10,375 26,077 30,743
Ravenswood charges 0 0 0 0
Other operating expense - net 0 0 0 0
Operating loss (9,517) 3,761 (26,077) (16,607)
Interest expense - third parties (5,101) (4,980) (15,236) (15,217)
Interest income (expense) - affiliates 9,947 9,163 29,222 28,242
Interest income - third parties 33 15 108 48
Net gain on forward and derivative contracts 0 (177) 0 0
Unrealized gain on fair value of contingent consideration   0   0
Other income (expense) - net 48 164 682 1,083
Loss before income taxes and equity in earnings of joint ventures (4,590) 7,946 (11,301) (2,451)
Income tax effect (877) 2,030 591 (1,158)
Loss before equity in earnings of joint ventures (5,467) 9,976 (10,710) (3,609)
Equity in earnings (loss) of joint ventures (52,806) (66,088) (73,241) (12,621)
Net loss (58,273) (56,112) (83,951) (16,230)
Other comprehensive income (loss) before income tax effect 1,206 (3,241) 3,618 16,964
Income tax effect (382) (383) (1,147) (1,148)
Other comprehensive income (loss) 824 (3,624) 2,471 15,816
Total comprehensive loss $ (57,449) (59,736) $ (81,480) (414)
Combined Guarantor Subsidiaries [Member]        
Condensed Statement of Income Captions [Line Items]        
Ownership percentage 100.00%   100.00%  
Revenue, Net [Abstract]        
Related parties $ 170,947 284,891 $ 502,707 1,052,963
Third-party customers 32,795 26,728 107,725 48,702
Total net sales 203,742 311,619 610,432 1,101,665
Cost of goods sold 231,082 359,072 653,258 1,107,955
Gross profit (loss) (27,340) (47,453) (42,826) (6,290)
Selling, general and administrative expenses 0 59 0 (115)
Ravenswood charges 0 0 0 0
Other operating expense - net 0 0 0 0
Operating loss (27,340) (47,512) (42,826) (6,175)
Interest expense - third parties (385) (391) (1,150) (1,186)
Interest income (expense) - affiliates 2,059 1,901 6,013 5,531
Interest income - third parties 0 0 9 4
Net gain on forward and derivative contracts 1,275 353 2,998 1,059
Unrealized gain on fair value of contingent consideration   1,523   18,337
Other income (expense) - net 14 92 29 (97)
Loss before income taxes and equity in earnings of joint ventures (24,377) (44,034) (34,927) 17,473
Income tax effect 0 0 0 0
Loss before equity in earnings of joint ventures (24,377) (44,034) (34,927) 17,473
Equity in earnings (loss) of joint ventures 0 0 0 0
Net loss (24,377) (44,034) (34,927) 17,473
Other comprehensive income (loss) before income tax effect 777 212 2,332 13,034
Income tax effect 0 0 0 0
Other comprehensive income (loss) 777 212 2,332 13,034
Total comprehensive loss (23,600) (43,822) (32,595) 30,507
Combined Non-Guarantor Subsidiaries [Member]        
Revenue, Net [Abstract]        
Related parties 152,449 156,167 438,660 491,946
Third-party customers 11 18 29 36
Total net sales 152,460 156,185 438,689 491,982
Cost of goods sold 141,957 148,949 411,651 426,441
Gross profit (loss) 10,503 7,236 27,038 65,541
Selling, general and administrative expenses 216 1,132 3,226 2,921
Ravenswood charges 26,830 0 26,830 30,850
Other operating expense - net 878 1,537 2,337 6,217
Operating loss (17,421) 4,567 (5,355) 25,553
Interest expense - third parties (45) (47) (135) (139)
Interest income (expense) - affiliates (12,006) (11,064) (35,235) (33,773)
Interest income - third parties 157 30 358 196
Net gain on forward and derivative contracts 0 109 0 145
Unrealized gain on fair value of contingent consideration   0   0
Other income (expense) - net (219) (142) (1,173) 2,005
Loss before income taxes and equity in earnings of joint ventures (29,534) (6,547) (41,540) (6,013)
Income tax effect 1,725 (32) 2,646 (11,047)
Loss before equity in earnings of joint ventures (27,809) (6,579) (38,894) (17,060)
Equity in earnings (loss) of joint ventures 155 704 891 2,069
Net loss (27,654) (5,875) (38,003) (14,991)
Other comprehensive income (loss) before income tax effect 303 (4,826) 910 (2,866)
Income tax effect 8 8 25 25
Other comprehensive income (loss) 311 (4,818) 935 (2,841)
Total comprehensive loss $ (27,343) $ (10,693) $ (37,068) $ (17,832)