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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	$ 326,977	$ 323,108
Derivatives asset, Fair Value	15,660	15,609
Derivative liability, notional	4,846,104	3,268,047
Derivative liability, Fair Value	13,605	14,162
Commodity Contracts [Member] | Future [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	4,503,000	2,943,000
Derivative liability, Fair Value	950	249
Other Contracts [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional	400	400
Derivative liability, Fair Value	6	2
Other Contracts [Member] | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	186,205	203,648
Derivatives asset, Fair Value	13,453	9,161
Derivative liability, notional		48,638
Derivative liability, Fair Value		923
To Be Announced Security [Member] | Other Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	134,400	35,650
Derivatives asset, Fair Value	1,296	4
Derivative liability, notional	134,400	24,350
Derivative liability, Fair Value	1,309	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	187,809	223,846
Derivative liability, Fair Value	11,198	11,614
Auction Rate Securities Purchase Commitment [Member] | Other Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	6,372
Derivatives asset, Fair Value	911
Derivative liability, notional	20,495	27,813
Derivative liability, Fair Value	$ 142	$ 1,369

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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