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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 398,237 | $ 323,108
Derivatives asset, Fair Value | 16,375 | 15,609
Derivative liability, notional | 5,152,204 | 3,268,047
Derivative liability, Fair Value | 13,101 | 14,162
Commodity Contracts [Member] | Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 4,060,000 | 2,943,000
Derivative liability, Fair Value | 709 | 249
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 400 | 400
Derivative liability, Fair Value | 17 | 2
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 248,420 | 203,648
Derivatives asset, Fair Value | 14,024 | 9,161
Derivative liability, notional |  | 48,638
Derivative liability, Fair Value |  | 923
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 680,000 |
Derivative liability, Fair Value | 0 |
To Be Announced Security [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 135,100 | 35,650
Derivatives asset, Fair Value | 803 | 4
Derivative liability, notional | 132,900 | 24,350
Derivative liability, Fair Value | 798 | 5
Tba Sale Agreements [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 3,480 | 83,810
Derivatives asset, Fair Value | 8 | 6,444
Derivative liability, notional | 257,592 | 223,846
Derivative liability, Fair Value | 11,018 | 11,614
Auction Rate Securities Purchase Commitment [Member] | Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 11,237 |
Derivatives asset, Fair Value | 1,540 |
Derivative liability, notional | 21,312 | 27,813
Derivative liability, Fair Value | $ 559 | $ 1,369

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