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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gains (losses) |  |  | $ 30,158 | $ (22,173)
Realized and unrealized (loss) gain on non-designated derivative instruments (note 11) | $ (2,870) | $ (8,516) | 3,748 | (28,987)
Foreign currency exchange (loss) gain (notes 8 and 11) | (2,843) | (11,624) | 4,117 | (6,885)
Unrealized gains (losses) |  |  | 8,199 | (3,660)
Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized and unrealized (loss) gain on non-designated derivative instruments (note 11) | (3,555) | 10,607 |  |
Realized gains (losses) | (1,293) | (35,274) |  | (37,091)
Unrealized gains (losses) | (2,262) | 45,881 |  |
Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) |  |  | (26,410) | (6,814)
Realized and unrealized (loss) gain on non-designated derivative instruments (note 11) |  |  | 3,748 | (28,987)
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net |  |  | 30,158 | (22,173)
Interest rate swap agreements | Gain (Loss) on Derivative Instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gains (losses) | (3,925) | (3,662) | (8,398) | (6,573)
Realized and unrealized (loss) gain on non-designated derivative instruments (note 11) | (2,870) | (8,516) | 21,760 | (28,948)
Derivative Instruments Not Designated As Hedging Instruments Unrealized Gain (Loss) Net | 1,055 | (4,854) | 30,158 | (22,375)
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 (loss) gain 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) | (1,293) | (1,430) |  |
Unrealized gains (losses) | (2,262) | 45,881 |  |
Cross-currency swap agreements termination | Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign currency exchange (loss) gain (notes 8 and 11) | 0 | (33,844) | 0 | (33,844)
Realized gains (losses) | 0 | (33,844) | 0 | (33,844)
Unrealized gains (losses) | 0 | 0 | 0 | 0
Cross-currency swap agreements | Foreign Currency Gain (Loss) [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized and unrealized (loss) gain on non-designated derivative instruments (note 11) |  |  | 229 | (40,750)
Foreign currency exchange (loss) gain (notes 8 and 11) | $ (3,555) | $ 44,451 | 229 | (6,906)
Realized gains (losses) |  |  | (2,638) | (3,247)
Unrealized gains (losses) |  |  | 2,867 | (3,659)
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 (loss) gain 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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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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