v2.4.0.8

Derivative Financial Instruments (Derivatives And Hedging-Overall-Subsequent Measurement) (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | $ 3,332 | $ (4,428)
NYMEX Commodity Contracts [Member] | Sales [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 2,823 | (1,761)
NYMEX Commodity Contracts [Member] | Operating Expenses [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 365 | (1,886)
Butane Futures Agreements [Member] | Cost of Sales [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | $ 144 | $ (781)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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