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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional | $ 40,550 | $ 7,970 |
Derivatives asset, Fair Value | 83 | 15 |
Derivative liability, notional | 2,895,319 | 3,449,249 |
Derivative liability, Fair Value | 417 | 220 |
To Be Announced Security [Member] | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional | 40,550 | 7,970 |
Derivatives asset, Fair Value | 83 | 15 |
Derivative liability, notional | 34,884 | 7,936 |
Derivative liability, Fair Value | 56 | 3 |
Future [Member] | Commodity Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 2,860,000 | 3,440,000 | [1]
Derivative liability, Fair Value | 296 | 22 | [1]
Auction Rate Securities Purchase Commitment | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 435 | 1,313 |
Derivative liability, Fair Value | $ 65 | $ 195 |
[1] | 10,770 shares of Class A Stock granted under share-based compensation arrangements.

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