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Condensed consolidating financial information - Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net cash provided by operating activities $ 31,866 $ 207,680 $ 19,718
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (54,700) (55,126) (68,077)
Purchase of Sebree smelter 0 (1,042) (48,058)
Investments in and advances to joint ventures 0 0 (125)
Purchase of remaining interest in Mt. Holly smelter 11,313 (65,100) 0
Proceeds from sale of property, plant and equipment 14 46 525
Restricted and other cash deposits 10 896 (1,439)
Intercompany transactions 0    
Net cash used in investing activities (43,363) (120,326) (117,174)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt 0 (2,603) (249,604)
Proceeds from issuance of debt 0 0 246,330
Borrowings under revolving credit facilities 1,737 92,423 22,725
Repayments under revolving credit facilities (1,737) (98,423) (16,725)
Repurchase of common stock (36,352) 0 0
Debt issuance costs 0 0 (3,994)
Debt retirement costs 0 0 (1,208)
Issuance of common stock 0 403 44
Intercompany transactions 0 0 0
Net cash used in financing activities (36,352) (8,200) (2,432)
CHANGE IN CASH AND CASH EQUIVALENTS (47,849) 79,154 (99,888)
Cash and cash equivalents, beginning of year 163,242 84,088 183,976
Cash and cash equivalents, end of year 115,393 163,242 84,088
The Company [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net cash provided by operating activities 25,423 92,338 30,462
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (8,574) (587) (1,229)
Purchase of Sebree smelter   (1,042) (48,058)
Investments in and advances to joint ventures     (125)
Purchase of remaining interest in Mt. Holly smelter 11,313 (65,100)  
Proceeds from sale of property, plant and equipment 0 0 0
Restricted and other cash deposits 0 0 0
Intercompany transactions (4,072)    
Net cash used in investing activities (1,333) (66,729) (49,412)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt   (2,603) (249,604)
Proceeds from issuance of debt     246,330
Borrowings under revolving credit facilities 1,737 92,423 16,725
Repayments under revolving credit facilities (1,737) (92,423) (16,725)
Repurchase of common stock (36,352)    
Debt issuance costs     (3,994)
Debt retirement costs     (1,208)
Issuance of common stock   403 44
Intercompany transactions 0 0 0
Net cash used in financing activities (36,352) (2,200) (8,432)
CHANGE IN CASH AND CASH EQUIVALENTS (12,262) 23,409 (27,382)
Cash and cash equivalents, beginning of year 70,683 47,274 74,656
Cash and cash equivalents, end of year 58,421 70,683 47,274
Combined Guarantor Subsidiaries [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net cash provided by operating activities 30,890 40,711 (70,217)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (21,477) (22,939) (17,199)
Purchase of Sebree smelter   0 0
Investments in and advances to joint ventures     0
Purchase of remaining interest in Mt. Holly smelter 0 0  
Proceeds from sale of property, plant and equipment 14 0 14
Restricted and other cash deposits (4) 0 (787)
Intercompany transactions 0    
Net cash used in investing activities (21,467) (22,939) (17,972)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt   0 0
Proceeds from issuance of debt     0
Borrowings under revolving credit facilities 0 0 0
Repayments under revolving credit facilities 0 0 0
Repurchase of common stock 0    
Debt issuance costs     0
Debt retirement costs     0
Issuance of common stock   0 0
Intercompany transactions (11,883) (17,801) 87,718
Net cash used in financing activities (11,883) (17,801) 87,718
CHANGE IN CASH AND CASH EQUIVALENTS (2,460) (29) (471)
Cash and cash equivalents, beginning of year (1,187) (1,158) (687)
Cash and cash equivalents, end of year (3,647) (1,187) (1,158)
Combined Non-Guarantor Subsidiaries [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net cash provided by operating activities 65,085 139,896 82,776
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (24,209) (31,603) (49,649)
Purchase of Sebree smelter   0 0
Investments in and advances to joint ventures     0
Purchase of remaining interest in Mt. Holly smelter 0 0  
Proceeds from sale of property, plant and equipment 0 46 511
Restricted and other cash deposits 14 896 (652)
Intercompany transactions 0    
Net cash used in investing activities (24,195) (30,661) (49,790)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt   0 0
Proceeds from issuance of debt     0
Borrowings under revolving credit facilities 0 0 6,000
Repayments under revolving credit facilities 0 (6,000) 0
Repurchase of common stock 0    
Debt issuance costs     0
Debt retirement costs     0
Issuance of common stock   0 0
Intercompany transactions (74,017) (47,461) (111,021)
Net cash used in financing activities (74,017) (53,461) (105,021)
CHANGE IN CASH AND CASH EQUIVALENTS (33,127) 55,774 (72,035)
Cash and cash equivalents, beginning of year 93,746 37,972 110,007
Cash and cash equivalents, end of year 60,619 93,746 37,972
Consolidating Adjustments [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net cash provided by operating activities (89,532) (65,265) (23,303)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (440) 3 0
Purchase of Sebree smelter   0 0
Investments in and advances to joint ventures     0
Purchase of remaining interest in Mt. Holly smelter 0 0  
Proceeds from sale of property, plant and equipment 0 0 0
Restricted and other cash deposits 0 0 0
Intercompany transactions 4,072    
Net cash used in investing activities 3,632 3 0
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt   0 0
Proceeds from issuance of debt     0
Borrowings under revolving credit facilities 0 0 0
Repayments under revolving credit facilities 0 0 0
Repurchase of common stock 0    
Debt issuance costs     0
Debt retirement costs     0
Issuance of common stock   0 0
Intercompany transactions 85,900 65,262 23,303
Net cash used in financing activities 85,900 65,262 23,303
CHANGE IN CASH AND CASH EQUIVALENTS 0 0 0
Cash and cash equivalents, beginning of year 0 0 0
Cash and cash equivalents, end of year $ 0 $ 0 $ 0