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Derivative Instruments (Impact of Derivative Instruments on Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Commodity Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 6,877 | $ 14,986
Derivative Liability, Fair Value, Gross Liability | (7,670) | (7,221)
Accounts receivable, net [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Current | 3,124 | 7,589
Derivative Asset, Fair Value, Gross Asset | 3,653 | 7,727
Derivative Liability, Fair Value, Gross Liability | (529) | (138)
Accounts receivable, net [Member] | Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Current | 520 | 1,498
Derivative Asset, Fair Value, Gross Asset | 1,049 | 1,636
Derivative Liability, Fair Value, Gross Liability | (529) | (138)
Accounts receivable, net [Member] | Not Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Current | 2,604 | 6,091
Derivative Asset, Fair Value, Gross Asset | 2,604 | 6,091
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Deferred Charges and other assets, net [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Noncurrent | 2,246 | 5,249
Derivative Asset, Fair Value, Gross Asset | 2,246 | 5,249
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Deferred Charges and other assets, net [Member] | Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Noncurrent | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Deferred Charges and other assets, net [Member] | Not Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Noncurrent | 2,246 | 5,249
Derivative Asset, Fair Value, Gross Asset | 2,246 | 5,249
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Accrued Liabilities [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Current | (1,048) | (1,349)
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (1,048) | (1,349)
Accrued Liabilities [Member] | Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Current | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Accrued Liabilities [Member] | Not Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Current | (1,048) | (1,349)
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (1,048) | (1,349)
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Noncurrent | (5,115) | (3,724)
Derivative Asset, Fair Value, Gross Asset | 978 | 2,010
Derivative Liability, Fair Value, Gross Liability | (6,093) | (5,734)
Other Liabilities [Member] | Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Noncurrent | (1,629) | (436)
Derivative Asset, Fair Value, Gross Asset | 978 | 2,010
Derivative Liability, Fair Value, Gross Liability | (2,607) | (2,446)
Other Liabilities [Member] | Not Subject to Master Netting [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Noncurrent | (3,486) | (3,288)
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | $ (3,486) | $ (3,288)

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- Definition Fair value, after the effects of master netting arrangements, of a 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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