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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 - Fair Values of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value
Asset Derivatives	$ 5,769	$ 742
Liability Derivatives	(1,525)	(11,608)
Designated as Hedging Instruments
Derivatives, Fair Value
Asset Derivatives	4,491	0
Liability Derivatives	(70)	(10,100)
Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	(70)	(112)
Designated as Hedging Instruments | Interest rate swaps | Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	4,491	0
Liability Derivatives	0	0
Designated as Hedging Instruments | Interest rate swaps | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	0	(5,394)
Designated as Hedging Instruments | Interest rate swaps | Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	0	(4,594)
Not Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	1,278	742
Liability Derivatives	$ (1,455)	$ (1,508)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
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-Name Accounting Standards Codification
-Topic 210
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