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Condensed consolidating financial information - Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:          
Net cash provided by operating activities $ (11,344) $ 14,903 $ 38,173 $ 31,866 $ 207,680
CASH FLOWS FROM INVESTING ACTIVITIES:          
Purchase of property, plant and equipment (9,045) (3,835) (21,944) (54,700) (55,126)
Purchase of Sebree smelter     0 0 (1,042)
Purchase of remaining interest in Mt. Holly smelter     0 11,313 (65,100)
Proceeds from sale of property, plant and equipment 13,585 0 1,040 14 46
Restricted and other cash deposits 253 0 (259) 10 896
Intercompany transactions 0   0 0  
Net cash used in investing activities 4,793 (3,835) (21,163) (43,363) (120,326)
CASH FLOWS FROM FINANCING ACTIVITIES:          
Repayment of debt     0 0 (2,603)
Borrowings under revolving credit facilities 233 371 1,179 1,737 92,423
Repayments under revolving credit facilities (233) (371) (1,179) (1,737) (98,423)
Repurchase of common stock     0 (36,352) 0
Issuance of common stock 43 0 0 0 403
Intercompany transactions 0 0 0 0 0
Net cash used in financing activities 43 0 0 (36,352) (8,200)
CHANGE IN CASH AND CASH EQUIVALENTS (6,508) 11,068 17,010 (47,849) 79,154
Cash and cash equivalents, beginning of year 132,403 115,393 115,393 163,242 84,088
Cash and cash equivalents, end of year 125,895 126,461 132,403 115,393 163,242
Consolidating Adjustments [Member]          
CASH FLOWS FROM OPERATING ACTIVITIES:          
Net cash provided by operating activities 0 8,266 0 (89,532) (65,265)
CASH FLOWS FROM INVESTING ACTIVITIES:          
Purchase of property, plant and equipment 0 0 0 (440) 3
Purchase of Sebree smelter         0
Purchase of remaining interest in Mt. Holly smelter       0 0
Proceeds from sale of property, plant and equipment 0   0 0 0
Restricted and other cash deposits 0   0 0 0
Intercompany transactions (30,400)   (11,519) 4,072  
Net cash used in investing activities (30,400) 0 (11,519) 3,632 3
CASH FLOWS FROM FINANCING ACTIVITIES:          
Repayment of debt         0
Borrowings under revolving credit facilities 0 0 0 0 0
Repayments under revolving credit facilities 0 0 0 0 0
Repurchase of common stock       0  
Issuance of common stock 0       0
Intercompany transactions 30,400 (8,266) 11,519 85,900 65,262
Net cash used in financing activities 30,400 (8,266) 11,519 85,900 65,262
CHANGE IN CASH AND CASH EQUIVALENTS 0 0 0 0 0
Cash and cash equivalents, beginning of year 0 0 0 0 0
Cash and cash equivalents, end of year 0 0 0 0 0
The Company [Member]          
CASH FLOWS FROM OPERATING ACTIVITIES:          
Net cash provided by operating activities (1,142) (8,754) (63,446) 25,423 92,338
CASH FLOWS FROM INVESTING ACTIVITIES:          
Purchase of property, plant and equipment (4,395) 0 (1,425) (8,574) (587)
Purchase of Sebree smelter         (1,042)
Purchase of remaining interest in Mt. Holly smelter       11,313 (65,100)
Proceeds from sale of property, plant and equipment 0   0 0 0
Restricted and other cash deposits 0   0 0 0
Intercompany transactions 19,224   27,761 (4,072)  
Net cash used in investing activities 14,829 0 26,336 (1,333) (66,729)
CASH FLOWS FROM FINANCING ACTIVITIES:          
Repayment of debt         (2,603)
Borrowings under revolving credit facilities 233 371 1,179 1,737 92,423
Repayments under revolving credit facilities (233) (371) (1,179) (1,737) (92,423)
Repurchase of common stock       (36,352)  
Issuance of common stock 43       403
Intercompany transactions (11,182) 0 15,359 0 0
Net cash used in financing activities (11,139) 0 15,359 (36,352) (2,200)
CHANGE IN CASH AND CASH EQUIVALENTS 2,548 (8,754) (21,751) (12,262) 23,409
Cash and cash equivalents, beginning of year 36,670 58,421 58,421 70,683 47,274
Cash and cash equivalents, end of year 39,218 49,667 36,670 58,421 70,683
Combined Guarantor Subsidiaries [Member]          
CASH FLOWS FROM OPERATING ACTIVITIES:          
Net cash provided by operating activities (21,757) 5,435 19,019 30,890 40,711
CASH FLOWS FROM INVESTING ACTIVITIES:          
Purchase of property, plant and equipment (2,346) (1,426) (7,807) (21,477) (22,939)
Purchase of Sebree smelter         0
Purchase of remaining interest in Mt. Holly smelter       0 0
Proceeds from sale of property, plant and equipment 0   0 14 0
Restricted and other cash deposits (3)   (3) (4) 0
Intercompany transactions 23,582   (15,305) 0  
Net cash used in investing activities 21,233 (1,426) (23,115) (21,467) (22,939)
CASH FLOWS FROM FINANCING ACTIVITIES:          
Repayment of debt         0
Borrowings under revolving credit facilities 0 0 0 0 0
Repayments under revolving credit facilities 0 0 0 0 0
Repurchase of common stock       0  
Issuance of common stock 0       0
Intercompany transactions 755 (436) 7,488 (11,883) (17,801)
Net cash used in financing activities 755 (436) 7,488 (11,883) (17,801)
CHANGE IN CASH AND CASH EQUIVALENTS 231 3,573 3,392 (2,460) (29)
Cash and cash equivalents, beginning of year (255) (3,647) (3,647) (1,187) (1,158)
Cash and cash equivalents, end of year (24) (74) (255) (3,647) (1,187)
Combined Non-Guarantor Subsidiaries [Member]          
CASH FLOWS FROM OPERATING ACTIVITIES:          
Net cash provided by operating activities 11,555 9,956 82,600 65,085 139,896
CASH FLOWS FROM INVESTING ACTIVITIES:          
Purchase of property, plant and equipment (2,304) (2,409) (12,712) (24,209) (31,603)
Purchase of Sebree smelter         0
Purchase of remaining interest in Mt. Holly smelter       0 0
Proceeds from sale of property, plant and equipment 13,585   1,040 0 46
Restricted and other cash deposits 256   (256) 14 896
Intercompany transactions (12,406)   (937) 0  
Net cash used in investing activities (869) (2,409) (12,865) (24,195) (30,661)
CASH FLOWS FROM FINANCING ACTIVITIES:          
Repayment of debt         0
Borrowings under revolving credit facilities 0 0 0 0 0
Repayments under revolving credit facilities 0 0 0 0 (6,000)
Repurchase of common stock       0  
Issuance of common stock 0       0
Intercompany transactions (19,973) 8,702 (34,366) (74,017) (47,461)
Net cash used in financing activities (19,973) 8,702 (34,366) (74,017) (53,461)
CHANGE IN CASH AND CASH EQUIVALENTS (9,287) 16,249 35,369 (33,127) 55,774
Cash and cash equivalents, beginning of year 95,988 60,619 60,619 93,746 37,972
Cash and cash equivalents, end of year $ 86,701 $ 76,868 $ 95,988 $ 60,619 $ 93,746