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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	$ 46,190	$ 297,727
Derivatives asset, Fair Value	1,339	1,663
Derivative Liability, Notional Amount	3,514,485	4,756,631
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	2,169	2,024
Commodity Contracts [Member] | Future [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	3,452,000	4,059,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	663	166
Other Contracts [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount		200
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		1
To Be Announced Security [Member] | Other Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	1,451	169,500
Derivatives asset, Fair Value	89	332
Derivative Liability, Notional Amount	2,223	169,500
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	100	289
Other TBA Contracts [Member] | Other Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives asset, Notional	44,739	121,573
Derivatives asset, Fair Value	1,250	482
Derivative Liability, Notional Amount	44,739	121,573
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,130	923
Auction Rate Securities Purchase Commitment [Member] | Other Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	15,523	24,358
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 276	$ 645

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

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+ References

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

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