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Significant Accounting Policies - Derivative Accounting (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional derivative contracts |  | $ 8,600,000 |  |  |
Net positive exposure |  | 43,000 | $ 52,000 |  |
Increase to retained earnings |  | 2,562,835 | 3,311,836 |  |
Gains (losses) on derivatives and hedging activities, net |  | 49,544 | 17,825 | $ (87) |
Retained Earnings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings |  | 1,722,365 | 1,850,512 | 1,340,017 | $ 868,182
Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings |  | (34,200) | (12,367) | $ 10,623 | $ 2,748
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings |  |  | $ (952,639) |  |
Cumulative Effect, Period of Adoption, Adjustment | Fair Value |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net positive exposure | $ 2,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Fair Value | Retained Earnings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings | 800 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Fair Value | Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gains (losses) on derivatives and hedging activities, net | 3,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Cash Flow | Retained Earnings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings | 200 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Cash Flow | Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Increase to retained earnings | $ 300 |  |  |  |
CME |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional derivative contracts |  | $ 8,200,000 |  |  |
Percent of total notional derivative contracts |  | 95.30% |  |  |
Amount of variation margin included as settlement |  | $ (179,000) |  |  |
LCH |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional derivative contracts |  | $ 400,000 |  |  |
Percent of total notional derivative contracts |  | 4.70% |  |  |
Amount of variation margin included as settlement |  | $ 19,000 |  |  |

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