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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, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	$ 729,500	$ 65,576
Derivatives asset, Fair Value	4,873	716
Derivative liability, notional	5,317,805	5,920,568
Derivative liability, Fair Value	6,780	1,388
Other Contracts | TBAs
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	729,500	26,000
Derivatives asset, Fair Value	4,873	22
Derivative liability, notional	729,500	26,000
Derivative liability, Fair Value	4,873	22
Other Contracts | Other TBAs (2)
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional		39,576
Derivatives asset, Fair Value		694
Derivative liability, notional		39,576
Derivative liability, Fair Value		592
Other Contracts | Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Derivative liability, notional	200
Derivative liability, Fair Value	4
Other Contracts | Auction Rate Securities Purchase Commitment
Derivatives, Fair Value [Line Items]
Derivative liability, notional	7,305	10,992
Derivative liability, Fair Value	1,096	8
Commodity Contracts | Futures
Derivatives, Fair Value [Line Items]
Derivative liability, notional	4,580,800	5,844,000	[1]
Derivative liability, Fair Value	$ 807	$ 766	[1]
[1] For the year ended December 31, 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 (10,592 and 1,237,134 shares for the years ended December 31, 2017 and 2016, respectively).(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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Nominal or face amount used to calculate payments on the derivative asset.

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