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Derivatives - Derivative Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure |  |
Loss on derivative contracts | $ 209 | $ 18,330
Cash (received) paid on settlements | (5,078) | 6,119
Commodity derivative contracts |  |
Derivative Instruments and Hedging Activities Disclosure |  |
Loss on derivative contracts | 209 | 18,330
Cash (received) paid on settlements | $ (5,078) | $ 6,119

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- Definition Derivative Instruments and Hedging Activities Disclosure [Line Items] + References No definition available. + Details
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- Definition Payments For (Proceeds From) Derivative Instruments Operating Activities + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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