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Derivative Instruments and Hedging Activities - Gain (Loss) for Derivative Instruments Not Designated or Qualifying as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gains (losses) |  |  | $ 34,178 | $ (18,553)
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) | $ 101 | $ (1,327) | 3,849 | (30,314)
Foreign currency exchange gain (loss) (notes 8 and 11) | 2,767 | (7,853) | 6,884 | (14,738)
Unrealized gains (losses) |  |  | 13,125 | (10,697)
Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) |  |  |  | (38,760)
Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) |  |  | (30,329) | (11,761)
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) |  |  | 3,849 | (30,314)
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net |  |  | 34,178 | (18,553)
Interest rate swap agreements | Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) | (3,919) | (4,947) | (12,317) | (11,520)
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) | 101 | (1,327) | 21,861 | (30,275)
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net | 4,020 | 3,620 | 34,178 | (18,755)
Foreign Exchange Forward [Member] | Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) |  |  | 0 | (241)
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) |  |  | 0 | (39)
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net |  |  | 0 | 202
Cross currency swap agreements | Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) | (1,595) | (1,669) |  |
Unrealized gains (losses) | (3,952) | 1,490 |  |
Cross-currency swap agreements termination | Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign currency exchange gain (loss) (notes 8 and 11) |  |  | 0 | (33,844)
Realized gains (losses) |  |  | 0 | (33,844)
Unrealized gains (losses) |  |  | 0 | 0
Cross-currency swap agreements | Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) |  |  | (5,318) | (40,929)
Foreign currency exchange gain (loss) (notes 8 and 11) | $ (5,547) | $ (179) | (5,318) | (7,085)
Realized gains (losses) |  |  | (4,233) | (4,916)
Unrealized gains (losses) |  |  | (1,085) | (2,169)
Interest rate swaps terminated | Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) |  |  | (18,012) | 0
Realized and unrealized gain (loss) on non-designated derivative instruments (note 11) |  |  | (18,012) | 0
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net |  |  | $ 0 | $ 0

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