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DERIVATIVE INSTRUMENTS - Schedule of Realized Gains (Losses) on Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended
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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)

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- 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 No definition available. + Details
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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 + Details
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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 + Details
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