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Foreign Exchange (Tables) | 12 Months Ended
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Dec. 31, 2021
Effects Of Changes In Foreign Exchange Rates [Abstract] |
Foreign exchange gains and losses |
| Years Ended December 31
| 2021 |  | 2020 |
Unrealized foreign exchange loss - intercompany notes(1) | $ | 12,000 |  | $ | 31,617 |
Unrealized foreign exchange gain - long-term notes & credit facilities | (13,905) |  | (22,385) |
Realized foreign exchange gain | (963) |  | (544) |
Foreign exchange (gain) loss | $ | (2,868) |  | $ | 8,688 |
(1)During 2020, a series of intercompany notes totaling US$751.0 million were issued from a Canadian subsidiary to a U.S. subsidiary. During 2021, US$150.0 million of these notes were redeemed and cancelled. At December 31, 2021, US$601.0 million of this series of intercompany notes remained outstanding. These notes are eliminated upon consolidation within the Statement of Financial Position and are revalued at the relevant foreign exchange rate at each period end. Foreign exchange gains or losses incurred within the Canadian subsidiary are recognized in unrealized foreign exchange gain or loss whereas those within the U.S. subsidiary are recognized in other comprehensive income.

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