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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
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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Nominal or face amount used to calculate payments on the derivative asset.

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