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Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jan. 01, 2021 | Dec. 31, 2020 | Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Investment in and loans, net to equity-accounted investments (notes 6b, 11a and 14) | $ 1,169,502 |  | $ 1,169,502 |  |  | $ 1,075,653 |
Non-controlling interest | 1,941,036 |  | 1,941,036 |  |  | 1,989,883 |
Accumulated deficit | (501,822) |  | (501,822) |  |  | (527,028) |
Other long-term liabilities (note 7) | 159,292 |  | 159,292 |  |  | 198,107 |
Long-term Debt | 2,113,179 |  | 2,113,179 |  |  | $ 2,055,107 |
Interest Expense | 47,268 | $ 53,175 | 144,901 | $ 174,940 |  |  |
Net Income (Loss) Attributable to Parent, Diluted | $ (2,913) | $ (35,407) | $ 25,194 | $ (63,489) |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | 0 | 0 | 0 | 0 |  |  |
• Diluted income (loss) attributable to shareholders of Teekay Corporation | $ (0.03) | $ (0.35) | $ 0.25 | $ (0.63) |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Dividends, Common Stock, Stock |  |  |  |  | $ (6,334) |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  | $ (53,300)
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | 6,300 |  |
Dividends, Common Stock, Stock |  |  |  |  | $ 6,300 |  |
Interest Expense | $ 800 |  | $ 2,300 |  |  |  |
Net Income (Loss) Attributable to Parent, Diluted | $ 1,600 |  | $ 4,800 |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | 9,588,378 |  | 9,588,378 |  |  |  |
• Diluted income (loss) attributable to shareholders of Teekay Corporation | $ 0.02 |  | $ 0.05 |  |  |  |

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