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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

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