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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Taxes [Abstract] |
Reconciliation of income taxes at statutory rates |
|  |  | Years ended December 31,
|  |  | 2014 |  | 2013 |  | 2012
Income taxed at statutory rates | $ | (7,314) | $ | (28,916) | $ | (34,860)
Increase (decrease) in taxes from: |  |  |  |  |  |
| Stock-based compensation |  | 41 |  | 13 |  | 147
| Meals and entertainment |  | 3 |  | 9 |  | 3
| Loss related to Mexico |  | - |  | (2,632) |  | -
| Other adjustments |  | - |  | (9) |  | 6
| Adjustment due to capital transactions |  | - |  | (60) |  | (733)
| Imputed interest |  | 3 |  | 3 |  | 24
| Realized fx gain (loss) on intercompany balances |  | - |  | (3) |  | (3)
| Prior year provision to actual adjustments |  | (4,511) |  | 9,961 |  | (40)
| Differences in tax rates |  | 541 |  | 3,451 |  | 3,905
| Effect of foreign exchange |  | 276 |  | - |  | (340)
| Change in effective tax rate |  | (1) |  | (407) |  | (333)
| Expiration of NOLs |  | 189 |  | 437 |  | 70
| Change in valuation allowance |  | 10,773 |  | 2,780 |  | 12,007
Income tax (benefit)/expense | $ | - | $ | (15,373) | $ | (20,147)
Schedule of Deferred Tax Assets and Liabilities |
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Deferred income tax assets |  |  |  |  |  |
Excess tax basis over book basis of property, plant and equipment | $ | 7,893 | $ | 7,496 | $ | 8,001
Marketable securities |  | 798 |  | 661 |  | 62
Operating loss carryforwards |  | 35,001 |  | 36,367 |  | 37,635
Capital loss carryforwards |  | 10,212 |  | 5,474 |  | 2,630
Other |  | 2,891 |  | 1,541 |  | 3,219
Unrealized foreign exchange on loans |  | - |  | 79 |  | 217
Total future tax assets |  | 56,795 |  | 51,618 |  | 51,764
Valuation allowance for future tax assets |  | (54,397) |  | (43,955) |  | (41,817)
|  | 2,398 |  | 7,663 |  | 9,947
Deferred income tax liabilities |  |  |  |  |  |
Other investments |  | 1,916 |  | 7,181 |  | 24,839
Amayapampa disposal consideration |  | 482 |  | 482 |  | 482
|  | 2,398 |  | 7,663 |  | 25,321
Total Deferred Taxes | $ | - | $ | - | $ | (15,374)
Summary of Tax Credit Carryforwards and Expirations |
|  | Noncapital |  |  |  |  |  |  |  |  |  |  |  |
|  | Canada (1) |  | U.S. |  | Mexico |  | Barbados |  | Total
2014 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | -
2015 |  |  | (889) |  |  | - |  |  | - |  |  | (2) |  |  | (891)
2016 |  |  | - |  |  | - |  |  | - |  |  | (1) |  |  | (1)
2017 |  |  | - |  |  | - |  |  | - |  |  | (6) |  |  | (6)
2018 |  |  | - |  |  | - |  |  | - |  |  | (20) |  |  | (20)
2019 |  |  | - |  |  | - |  |  | - |  |  | (42) |  |  | (42)
2020 |  |  | - |  |  | - |  |  | - |  |  | (20) |  |  | (20)
2021 |  |  | - |  |  | - |  |  | - |  |  | (31) |  |  | (31)
2022 |  |  | - |  |  | - |  |  | (6) |  |  | (23) |  |  | (29)
2023 |  |  | - |  |  | - |  |  | (397) |  |  | - |  |  | (397)
2024 |  |  | - |  |  | - |  |  | (140) |  |  | - |  |  | (140)
2025 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
2026 |  |  | (1,027) |  |  | (1,166) |  |  | - |  |  | - |  |  | (2,193)
2027 |  |  | (847) |  |  | (1,700) |  |  | - |  |  | - |  |  | (2,547)
2028 |  |  | (5,245) |  |  | (1,719) |  |  | - |  |  | - |  |  | (6,964)
2029 |  |  | (4,022) |  |  | (1,970) |  |  | - |  |  | - |  |  | (5,992)
2030 |  |  | (5,032) |  |  | (1,827) |  |  | - |  |  | - |  |  | (6,859)
2031 |  |  | (3,806) |  |  | (3,407) |  |  | - |  |  | - |  |  | (7,213)
2032 |  |  | (6,397) |  |  | (2,323) |  |  | - |  |  | - |  |  | (8,720)
2033 |  |  | (9,576) |  |  | (3,098) |  |  | - |  |  | - |  |  | (12,674)
2034 |  |  | (4,323) |  |  | - |  |  |  |  |  |  |  |  | (4,323)
|  | $ | (41,164) |  | $ | (17,210) |  | $ | (543) |  | $ | (146) |  | $ | (59,062)
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  |  | Years ended December 31,
|  | 2014 |  | 2013 |  | 2012
U.S. |  | $ | (6,705) |  | $ | (49,124) |  | $ | (52,448)
Canada |  |  | (7,750) |  |  | (9,540) |  |  | (11,962)
Other Foreign |  |  | (4,471) |  |  | (16,197) |  |  | (26,393)
|  | $ | (18,926) |  | $ | (74,861) |  | $ | (90,803)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  |  |  | Years ended December 31,
|  |  | 2014 |  | 2013 |  | 2012
Deferred income tax benefit |  |  |  |  |  |  |  |
| U.S. |  | $ | - |  | $ | (15,373) |  | $ | (20,147)
| Canada |  |  | - |  |  | - |  |  | -
| Other Foreign |  |  | - |  |  | - |  |  | -
Total tax benefit | $ | - |  | $ | (15,373) |  | $ | (20,147)

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