v2.4.0.6

Income taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Components of income tax expenses (benefit) |  |  |
Current income tax expense (benefit) | $ 7,773,000 | $ 1,584,000 | $ 960,000
Deferred tax expense (benefit) | (34,055,000) | (9,908,000) | 17,964,000
Total income tax expense (benefit) | (28,083,000) | (11,104,000) | 16,018,000
Canadian enacted statutory rate (as a percent) | 25.00% | 26.50% | 28.50%
Reconciliation of income taxes |  |  |
Computed income taxes at Canadian statutory rate | (36,216,000) | (21,975,000) | (3,410,000)
Increases (decreases) resulting from: |  |  |
Dividend withholding tax | 5,912,000 | 371,000 | 765,000
Various Income Tax rates for Operating Countries | (8,532,000) | (10,553,000) | (1,220,000)
Foreign exchange | 1,505,000 | (113,000) |
Permanent differences | (6,459,000) | (1,479,000) |
Changes in tax rates | 1,805,000 |  |
Non-deductible acquisition costs | 637,000 | 4,287,000 |
Non-deductible interest expense |  | 2,134,000 |
Federal grant |  | (6,573,000) |
Prior year true-up | (5,142,000) | 2,246,000 |
Other | (1,779,000) | (1,118,000) | 38,000
Income tax expense (benefit) after adjustments for operating countries with different income tax rates | (44,748,000) | (32,528,000) | (4,630,000)
Valuation allowance | 20,186,000 | 21,669,000 | 19,845,000
Income tax expense (benefit) after adjustments for operating countries with different income tax rates and valuation allowance | (24,562,000) | (10,859,000) | 15,215,000
Total other reconciliation items | (3,521,000) | (245,000) | 803,000
Total income tax expense (benefit) | (28,083,000) | (11,104,000) | 16,018,000
Deferred tax assets: |  |  |
Loss carryforwards | 130,149,000 | 122,472,000 |
Other accrued liabilities | 10,906,000 | 28,059,000 |
Finance and share issuance costs | 8,349,000 | 6,532,000 |
Disallowed interest carryforward | 2,214,000 | 9,189,000 |
Derivative contracts | 3,481,000 |  |
Unrealized foreign exchange loss |  | 441,000 |
Other | 6,094,000 |  |
Total deferred tax assets | 161,193,000 | 166,693,000 |
Valuations allowance | (116,002,000) | (89,020,000) |
Net deferred tax assets | 45,191,000 | 77,673,000 |
Deferred tax liabilities: |  |  |
Intangible assets | (113,277,000) | (121,055,000) |
Property, plant and equipment | (94,660,000) | (133,689,000) |
Derivative contracts |  | (4,752,000) |
Other long-term investments | 1,272,000 | (921,000) |
Other |  | (181,000) |
Total deferred tax liabilities | (209,209,000) | (260,598,000) |
Net deferred tax liability | (164,018,000) | (182,925,000) |
Net deferred tax position |  |  |
Long-term deferred tax liabilities, net | (164,018,000) | (182,925,000) |
Net deferred tax liability | $ (164,018,000) | $ (182,925,000) |

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