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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Assets and liabilities measured at fair value on a recurring basis |  |  |
Restricted cash |  |  | $ 1,033
Commodity derivatives, net | $ (33,095) | $ 536 | (5,628)
Provisionally price contracts | (62,298) | (165,284) | (118,737)
Convertible preferred securities | 7,488 | 7,388 | 3,294
Other assets and liabilities | 4,099 | 8,461 | 7,997
Total | (83,806) | (148,899) | (112,041)
Level 1 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Restricted cash |  |  | 1,033
Commodity derivatives, net | 15,356 | 18,603 | 2,817
Provisionally price contracts | (37,787) | (98,190) | (87,958)
Convertible preferred securities | 0 | 0 | 0
Other assets and liabilities | 4,136 | 9,705 | 10,155
Total | (18,295) | (69,882) | (73,953)
Level 2 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Restricted cash |  |  | 0
Commodity derivatives, net | (48,451) | (18,067) | (8,445)
Provisionally price contracts | (24,511) | (67,094) | (30,779)
Convertible preferred securities | 0 | 0 | 0
Other assets and liabilities | (37) | (1,244) | (2,158)
Total | (72,999) | (86,405) | (41,382)
Level 3 |  |  |
Assets and liabilities measured at fair value on a recurring basis |  |  |
Restricted cash |  |  | 0
Commodity derivatives, net | 0 | 0 | 0
Provisionally price contracts | 0 | 0 | 0
Convertible preferred securities | 7,488 | 7,388 | 3,294
Other assets and liabilities | 0 | 0 | 0
Total | $ 7,488 | $ 7,388 | $ 3,294

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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=77997519&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=77997519&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=82849420&loc=SL20226008-175313 + Details
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