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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 7,970 |
Derivatives asset, Fair Value | 15 |
Derivative liability, notional | 3,449,249 | $ 5,229,373
Derivative liability, Fair Value | 220 | 1,414
Other Contracts | TBAs |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 7,970 |
Derivatives asset, Fair Value | 15 |
Derivative liability, notional | 7,936 | 13,245
Derivative liability, Fair Value | 3 | 124
Other Contracts | Auction Rate Securities Purchase Commitment |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 1,313 | 7,128
Derivative liability, Fair Value | 195 | 1,023
Commodity Contracts | Futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 3,440,000 | 5,209,000
Derivative liability, Fair Value | $ 22 | $ 267

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