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Condensed consolidating financial information - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Statement of Income Captions [Line Items]                        
Ownership percentage   100.00%               100.00%    
NET SALES:                        
Related parties $ 280,573       $ 280,377         $ 1,178,631 $ 1,867,711 $ 1,262,101
Third-party customers 85,213       38,477         140,463 82,146 668,941
Sales Revenue – net 365,786 $ 339,836 $ 333,650 $ 326,754 318,854 $ 383,915 $ 454,540 $ 523,491 $ 587,911 1,319,094 1,949,857 1,931,042
Cost of goods sold 348,935       321,906         1,330,136 1,908,544 1,729,243
Gross profit (loss) 16,851 5,057 (17,612) 5,582 (3,052) (18,701) (42,423) 8,342 94,095 (11,042) 41,313 201,799
Selling, general and administrative expenses 10,702       9,625         40,264 42,115 49,195
Helguvik impairment                   152,220 0 0
Ravenswood charges                   26,830 30,850 0
Other operating expense - net 973       881         3,857 7,436 12,481
Operating income (loss) 5,176       (13,558)         (234,213) (39,088) 140,123
Interest expense - third parties 5,571       5,493         (22,216) (21,954) (22,015)
Interest income (expense) - affiliates 0       0         0 0 0
Interest income - third parties 230       114         758 339 301
Net gain on forward and derivative contracts (16,137)       353         3,487 1,600 179
Unrealized gain on fair value of contingent consideration                 6,527 0 18,337 7,943
Gain on remeasurement of equity investment                   0 0 15,955
Other income (expense) - net 384       (6)         1,319 (356) 991
Income (loss) before income taxes and equity in earnings of joint ventures (15,918)       (18,590)         (250,865) (41,122) 143,477
Income tax benefit (expense) 308       2,070         (2,824) (9,276) (18,308)
Income (loss) before equity in earnings of joint ventures (15,610)       (16,520)         (253,689) (50,398) 125,169
BHH impairment                   0 (11,584) 0
Equity in earnings of joint ventures 471       357         1,274 2,672 1,305
Net income (loss) (15,139) $ (168,464) $ (58,273) $ (9,515) (16,163) $ (43,080) $ (56,112) $ (33,897) $ 73,779 (252,415) (59,310) 126,474
Other comprehensive income (loss) before income tax effect 1,786       1,206         288 6,568 (36,672)
Income tax effect (1,074)       (383)         (1,531) (1,536) (1,829)
Other comprehensive income (loss) 712       823         (1,243) 5,032 (38,501)
Total comprehensive income (loss) (14,427)       (15,340)         (253,658) (54,278) 87,973
Consolidating Adjustments [Member]                        
NET SALES:                        
Related parties 0       (23,397)         0 (42,360) (78,771)
Third-party customers 0       0         0 (224) (556)
Sales Revenue – net 0       (23,397)         0 (42,584) (79,327)
Cost of goods sold 0       (23,971)         0 (44,236) (75,494)
Gross profit (loss) 0       574         0 1,652 (3,833)
Selling, general and administrative expenses 0       0         0 0 0
Helguvik impairment                   0    
Ravenswood charges                   0 0  
Other operating expense - net 0       0         0 0 0
Operating income (loss) 0       574         0 1,652 (3,833)
Interest expense - third parties 0       0         0 0 0
Interest income (expense) - affiliates 0       0         0 0 0
Interest income - third parties 0       0         0 0 0
Net gain on forward and derivative contracts 0       0         0 0 0
Unrealized gain on fair value of contingent consideration                     0 0
Gain on remeasurement of equity investment                       0
Other income (expense) - net 0       0         0 (3,410) (3,632)
Income (loss) before income taxes and equity in earnings of joint ventures 0       574         0 (1,758) (7,465)
Income tax benefit (expense) 0       0         0 0 173
Income (loss) before equity in earnings of joint ventures 0       574         0 (1,758) (7,292)
BHH impairment                     0  
Equity in earnings of joint ventures 9,358       13,775         241,427 52,296 (141,178)
Net income (loss) 9,358       14,349         241,427 50,538 (148,470)
Other comprehensive income (loss) before income tax effect (1,654)       (1,081)         (7,002) (13,640) 18,967
Income tax effect (8)       (8)         24 (33) (33)
Other comprehensive income (loss) (1,662)       (1,089)         (6,978) (13,673) 18,934
Total comprehensive income (loss) 7,696       13,260         234,449 36,865 (129,536)
The Company [Member]                        
NET SALES:                        
Related parties 0       0         0 0 0
Third-party customers 0       0         0 0 0
Sales Revenue – net 0       0         0 0 0
Cost of goods sold 0       0         0 0 0
Gross profit (loss) 0       0         0 0 0
Selling, general and administrative expenses 10,200       8,299         20,704 28,000 32,840
Helguvik impairment                   0    
Ravenswood charges                   0 0  
Other operating expense - net 0       0         0 0 0
Operating income (loss) (10,200)       (8,299)         (20,704) (28,000) (32,840)
Interest expense - third parties 5,148       5,065         (20,378) (20,201) (20,228)
Interest income (expense) - affiliates (8,982)       (9,548)         39,211 37,626 43,688
Interest income - third parties 80       37         182 65 15
Net gain on forward and derivative contracts 0       0         0 0 (1,080)
Unrealized gain on fair value of contingent consideration                     0 0
Gain on remeasurement of equity investment                       0
Other income (expense) - net 787       771         1,239 1,356 518
Income (loss) before income taxes and equity in earnings of joint ventures (5,499)       (3,008)         (450) (9,154) (9,927)
Income tax benefit (expense) 571       620         1,925 2,140 (4,777)
Income (loss) before equity in earnings of joint ventures (4,928)       (2,388)         1,475 (7,014) (14,704)
BHH impairment                     0  
Equity in earnings of joint ventures (10,211)       (13,775)         (253,890) (52,296) 141,178
Net income (loss) (15,139)       (16,163)         (252,415) (59,310) 126,474
Other comprehensive income (loss) before income tax effect 1,786       1,206         288 6,568 (24,022)
Income tax effect (1,074)       (383)         (1,531) (1,536) (1,829)
Other comprehensive income (loss) 712       823         (1,243) 5,032 (25,851)
Total comprehensive income (loss) $ (14,427)       (15,340)         (253,658) (54,278) 100,623
Combined Guarantor Subsidiaries [Member]                        
Condensed Statement of Income Captions [Line Items]                        
Ownership percentage 100.00%                      
NET SALES:                        
Related parties $ 131,068       162,120         668,486 1,277,474 715,796
Third-party customers 85,183       38,468         140,426 82,327 669,466
Sales Revenue – net 216,251       200,588         808,912 1,359,801 1,385,262
Cost of goods sold 213,751       209,573         862,632 1,388,400 1,282,194
Gross profit (loss) 2,500       (8,985)         (53,720) (28,599) 103,068
Selling, general and administrative expenses 0       0         9,853 8,798 11,353
Helguvik impairment                   0    
Ravenswood charges                   0 0  
Other operating expense - net 0       0         0 0 0
Operating income (loss) 2,500       (8,985)         (63,573) (37,397) 91,715
Interest expense - third parties 379       382         (1,659) (1,567) (1,555)
Interest income (expense) - affiliates (2,081)       0         8,107 0 0
Interest income - third parties 0       0         10 4 0
Net gain on forward and derivative contracts (15,847)       353         3,487 1,411 1,259
Unrealized gain on fair value of contingent consideration                     18,337 7,943
Gain on remeasurement of equity investment                       15,955
Other income (expense) - net 47       (6)         218 (658) (459)
Income (loss) before income taxes and equity in earnings of joint ventures (11,598)       (9,020)         (53,410) (19,870) 114,858
Income tax benefit (expense) 493       0         0 0 (493)
Income (loss) before equity in earnings of joint ventures (11,105)       (9,020)         (53,410) (19,870) 114,365
BHH impairment                     0  
Equity in earnings of joint ventures 853       0         12,463 0 0
Net income (loss) (10,252)       (9,020)         (40,947) (19,870) 114,365
Other comprehensive income (loss) before income tax effect 1,306       778         1,868 14,754 (28,955)
Income tax effect 0       0         0 0 0
Other comprehensive income (loss) 1,306       778         1,868 14,754 (28,955)
Total comprehensive income (loss) (8,946)       (8,242)         (39,079) (5,116) 85,410
Combined Non-Guarantor Subsidiaries [Member]                        
NET SALES:                        
Related parties 149,505       141,654         510,145 632,597 625,076
Third-party customers 30       9         37 43 31
Sales Revenue – net 149,535       141,663         510,182 632,640 625,107
Cost of goods sold 135,184       136,304         467,504 564,380 522,543
Gross profit (loss) 14,351       5,359         42,678 68,260 102,564
Selling, general and administrative expenses 502       1,326         9,707 5,317 5,002
Helguvik impairment                   152,220    
Ravenswood charges                   26,830 30,850  
Other operating expense - net 973       881         3,857 7,436 12,481
Operating income (loss) 12,876       3,152         (149,936) 24,657 85,081
Interest expense - third parties 44       46         (179) (186) (232)
Interest income (expense) - affiliates 11,063       9,548         (47,318) (37,626) (43,688)
Interest income - third parties 150       77         566 270 286
Net gain on forward and derivative contracts (290)       0         0 189 0
Unrealized gain on fair value of contingent consideration                     0 0
Gain on remeasurement of equity investment                       0
Other income (expense) - net (450)       (771)         (138) 2,356 4,564
Income (loss) before income taxes and equity in earnings of joint ventures 1,179       (7,136)         (197,005) (10,340) 46,011
Income tax benefit (expense) (756)       1,450         (4,749) (11,416) (13,211)
Income (loss) before equity in earnings of joint ventures 423       (5,686)         (201,754) (21,756) 32,800
BHH impairment                     (11,584)  
Equity in earnings of joint ventures 471       357         1,274 2,672 1,305
Net income (loss) 894       (5,329)         (200,480) (30,668) 34,105
Other comprehensive income (loss) before income tax effect 348       303         5,134 (1,114) (2,662)
Income tax effect 8       8         (24) 33 33
Other comprehensive income (loss) 356       311         5,110 (1,081) (2,629)
Total comprehensive income (loss) $ 1,250       $ (5,018)         $ (195,370) $ (31,749) $ 31,476