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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, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional |  | $ 729,500 |
Derivatives asset, Fair Value |  | 4,873 |
Derivative liability, notional | $ 4,484,429 | 5,317,805 |
Derivative liability, Fair Value | 2,122 | 6,780 |
To Be Announced Security [Member] | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional |  | 729,500 |
Derivatives asset, Fair Value |  | 4,873 |
Derivative liability, notional | 3,400 | 200 |
Derivative liability, Fair Value | 47 | 4 |
Other TBA Contracts [Member] | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional |  | 729,500 |
Derivative liability, Fair Value |  | 4,873 |
Future [Member] | Commodity Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 4,473,000 | 4,580,800 | [1]
Derivative liability, Fair Value | 959 | 807 | [1]
Foreign exchange forward contracts | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 600 |  |
Derivative liability, Fair Value | 2 |  |
Auction Rate Securities Purchase Commitment | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 7,429 | 7,305 |
Derivative liability, Fair Value | $ 1,114 | $ 1,096 |
[1] | For the three months ended March 31, 2019, the diluted net income per share computation does not include the anti-dilutive effect of 7,628 shares of Class A Stock granted under share-based compensation arrangements (4,050 shares for three months ended March 31, 2018).

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