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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 209,697 | $ 323,108
Derivatives asset, Fair Value | 1,827 | 15,609
Derivative Liability, Notional Amount | 5,505,328 | 3,268,047
Derivative liability, Fair Value | 1,413 | 14,162
Commodity Contracts [Member] | Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 4,582,000 | 2,943,000
Derivative liability, Fair Value | 209 | 249
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 200 | 400
Derivative liability, Fair Value | 1 | 2
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 685 | 203,648
Derivatives asset, Fair Value | 53 | 9,161
Derivative Liability, Notional Amount |  | 48,638
Derivative liability, Fair Value |  | 923
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 698,000 |
Derivative liability, Fair Value | 0 |
To Be Announced Security [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 202,500 | 35,650
Derivatives asset, Fair Value | 869 | 4
Derivative Liability, Notional Amount | 202,500 | 24,350
Derivative liability, Fair Value | 888 | 5
Tba Sale Agreements [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional |  | 83,810
Derivatives asset, Fair Value |  | 6,444
Derivative Liability, Notional Amount | 685 | 223,846
Derivative liability, Fair Value | 39 | 11,614
Auction Rate Securities Purchase Commitment [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 6,512 |
Derivatives asset, Fair Value | 905 |
Derivative Liability, Notional Amount | 21,943 | 27,813
Derivative liability, Fair Value | $ 276 | $ 1,369

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