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Condensed consolidating financial information - Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | $ 15,582 | $ 32,509
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (13,127) | (47,595)
Purchase of remaining interest in Mt. Holly smelter | 0 | 11,313
Restricted and other cash deposits | (255) | (141)
Net cash used in investing activities | (13,382) | (36,423)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 900 | 1,414
Repayments under revolving credit facilities | (900) | (1,414)
Repurchase of common stock | 0 | (36,352)
Intercompany transactions | 0 | 0
Net cash used in financing activities | 0 | (36,352)
CHANGE IN CASH AND CASH EQUIVALENTS | 2,200 | (40,266)
Cash and cash equivalents, beginning of period | 115,393 | 163,242
Cash and cash equivalents, end of period | 117,593 | 122,976
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 15,985 | 180,347
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | 0 | (440)
Purchase of remaining interest in Mt. Holly smelter |  | 0
Restricted and other cash deposits | 0 | 0
Net cash used in investing activities | 0 | (440)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Repurchase of common stock |  | 0
Intercompany transactions | (15,985) | (179,907)
Net cash used in financing activities | (15,985) | (179,907)
CHANGE IN CASH AND CASH EQUIVALENTS | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 0
Cash and cash equivalents, end of period | 0 | 0
The Company [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (20,816) | 43,577
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | 0 | (3,513)
Purchase of remaining interest in Mt. Holly smelter |  | 0
Restricted and other cash deposits | 0 | 0
Net cash used in investing activities | 0 | (3,513)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 900 | 1,414
Repayments under revolving credit facilities | (900) | (1,414)
Repurchase of common stock |  | (36,352)
Intercompany transactions | 0 | 0
Net cash used in financing activities | 0 | (36,352)
CHANGE IN CASH AND CASH EQUIVALENTS | (20,816) | 3,712
Cash and cash equivalents, beginning of period | 58,421 | 70,683
Cash and cash equivalents, end of period | 37,605 | 74,395
Combined Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 23,044 | 6,535
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (4,252) | (23,555)
Purchase of remaining interest in Mt. Holly smelter |  | 11,313
Restricted and other cash deposits | 1 | (155)
Net cash used in investing activities | (4,251) | (12,397)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Repurchase of common stock |  | 0
Intercompany transactions | (15,271) | 6,433
Net cash used in financing activities | (15,271) | 6,433
CHANGE IN CASH AND CASH EQUIVALENTS | 3,522 | 571
Cash and cash equivalents, beginning of period | (3,647) | (1,187)
Cash and cash equivalents, end of period | (125) | (616)
Combined Non-Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (2,631) | (197,950)
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (8,875) | (20,087)
Purchase of remaining interest in Mt. Holly smelter |  | 0
Restricted and other cash deposits | (256) | 14
Net cash used in investing activities | (9,131) | (20,073)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Repurchase of common stock |  | 0
Intercompany transactions | 31,256 | 173,474
Net cash used in financing activities | 31,256 | 173,474
CHANGE IN CASH AND CASH EQUIVALENTS | 19,494 | (44,549)
Cash and cash equivalents, beginning of period | 60,619 | 93,746
Cash and cash equivalents, end of period | $ 80,113 | $ 49,197

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