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DERIVATIVE INSTRUMENTS - Schedule of Realized Gains (Losses) on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Unrealized Gain/(Loss)	$ 2,491	$ 1,772
Realized Gain/(Loss)	(13,525)	13,187
Net Result from Derivative Transactions	(11,034)	14,959
Futures
Derivative [Line Items]
Unrealized Gain/(Loss)	2,557	320
Realized Gain/(Loss)	(13,533)	14,372
Net Result from Derivative Transactions	(10,976)	14,692
Swaps
Derivative [Line Items]
Unrealized Gain/(Loss)		1,403
Realized Gain/(Loss)		(848)
Net Result from Derivative Transactions		555
Credit Derivatives
Derivative [Line Items]
Unrealized Gain/(Loss)	(66)	49
Realized Gain/(Loss)	8	(337)
Net Result from Derivative Transactions	$ (58)	$ (288)

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, held at each balance sheet date, that was included in earnings for the period.

+ References

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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