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Fair Value Measurements (Details 1) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Assets and liabilities measured at fair value on a recurring basis |  |  |
Cash equivalents |  |  | $ 25,496
Restricted cash | $ 752 | $ 471 | 718
Commodity derivatives, net | 18,024 | 22,041 | 27,419
Provisionally price contracts | (123,957) | (170,197) | 131,192
Convertible preferred securities | 3,294 | 3,294 | 775
Other assets and liabilities | 6,377 | 6,861 | 9,290
Total | (95,510) | (137,530) | 194,890
Level 1 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Cash equivalents |  |  | 25,496
Restricted cash | 752 | 471 | 718
Commodity derivatives, net | 29,566 | 29,872 | 38,070
Provisionally price contracts | (86,314) | (105,321) | 88,356
Convertible preferred securities | 0 | 0 | 0
Other assets and liabilities | 8,518 | 9,391 | 13,958
Total | (47,478) | (65,587) | 166,598
Level 2 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Cash equivalents |  |  | 0
Restricted cash | 0 | 0 | 0
Commodity derivatives, net | (11,542) | (7,831) | (10,651)
Provisionally price contracts | (37,643) | (64,876) | 42,836
Convertible preferred securities | 0 | 0 | 0
Other assets and liabilities | (2,141) | (2,530) | (4,828)
Total | (51,326) | (75,237) | 27,357
Level 3 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Cash equivalents |  |  | 0
Restricted cash | 0 | 0 | 0
Commodity derivatives, net | 0 | 0 | 0
Provisionally price contracts | 0 | 0 | 0
Convertible preferred securities | 3,294 | 3,294 | 775
Other assets and liabilities | 0 | 0 | 160
Total | $ 3,294 | $ 3,294 | $ 935

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- Definition Fair value assets measured on recurring basis restricted cash. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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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. 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 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: 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 3: 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=49121117&loc=d3e13433-108611 Reference 4: 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 5: 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=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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