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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional | $ 596,931 | $ 65,576 |
Derivatives asset, Fair Value | 12,309 | 716 |
Derivative liability, notional | 4,324,364 | 5,920,568 |
Derivative liability, Fair Value | 14,048 | 1,388 |
To Be Announced Security [Member] | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional | 568,430 | 26,000 |
Derivatives asset, Fair Value | 11,057 | 22 |
Derivative liability, notional | 568,430 | 26,000 |
Derivative liability, Fair Value | 11,068 | 22 |
Other TBA Contracts [Member] | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, Notional | 28,501 | 39,576 |
Derivatives asset, Fair Value | 1,252 | 694 |
Derivative liability, notional | 28,501 | 39,576 |
Derivative liability, Fair Value | 1,190 | 592 |
Future [Member] | Commodity Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 3,720,000 | 5,844,000 | [1]
Derivative liability, Fair Value | 709 | 766 | [1]
Foreign exchange forward contracts | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 200 |  |
Derivative liability, Fair Value | 2 |  |
Auction Rate Securities Purchase Commitment | Other Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, notional | 7,233 | 10,992 |
Derivative liability, Fair Value | $ 1,079 | $ 8 |
[1] | For both the three and nine months ended September 30, 2018, the diluted net income per share computation does not include the anti-dilutive effect of 4,050 shares of Class A Stock granted under share-based compensation arrangements (15,450 shares for both the three and nine months ended September 30, 2017).(2)Represents net income from discontinued operations less net income attributable to non-controlling interest, net of tax divided by weighted average number of shares outstanding.

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