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Derivative instruments (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
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Derivatives, Fair Value [Line Items] |  |  |
Derivative asset, fair value, gross asset | $ 330 | $ 1,950 | $ 6,179
Derivative liability fair value gross liability | 12,186 | 7,483 | 12,445
Designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments in hedges, assets, at fair value | 0 | 0 | 1,623
Derivative instruments in hedges, liabilities, at fair value | 0 | 0 | 10,986
Designated as hedging instrument [Member] | Commodity contract [Member] | Commodity derivative instruments - current assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments in hedges, assets, at fair value | 0 | 0 | 1,623
Designated as hedging instrument [Member] | Commodity contract [Member] | Commodity derivative instruments - current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments in hedges, liabilities, at fair value | 0 | 0 | 5,994
Designated as hedging instrument [Member] | Commodity contract [Member] | Other liabilities noncurrent [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments in hedges, liabilities, at fair value | 0 | 0 | 534
Designated as hedging instrument [Member] | Interest rate swap [Member] | Other accrued liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments in hedges, liabilities, at fair value | 0 | 0 | 4,458
Not designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other derivatives not designated as hedging instruments assets at fair value | 330 | 1,950 | 4,556
Other derivatives not designated as hedging instruments liabilities at fair value | 12,186 | 7,483 | 1,459
Not designated as hedging instrument [Member] | Commodity contract [Member] | Commodity derivative instruments - current assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other derivatives not designated as hedging instruments assets at fair value | 81 | 1,447 | 4,313
Not designated as hedging instrument [Member] | Commodity contract [Member] | Other assets noncurrent [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other derivatives not designated as hedging instruments assets at fair value | 249 | 503 | 243
Not designated as hedging instrument [Member] | Commodity contract [Member] | Commodity derivative instruments - current liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other derivatives not designated as hedging instruments liabilities at fair value | 12,186 | 7,483 | 1,385
Not designated as hedging instrument [Member] | Commodity contract [Member] | Other liabilities noncurrent [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other derivatives not designated as hedging instruments liabilities at fair value | $ 0 | $ 0 | $ 74

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- Definition Fair value before 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. + References Reference 1: 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=28370219&loc=SL20226000-175313 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=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or 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. + References Reference 1: 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=28370219&loc=SL20226000-175313 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=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: 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=28364263&loc=d3e13433-108611 + Details
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- Definition Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: 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=28364263&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of all derivative liabilities not designated as a hedging instrument. + References Reference 1: 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=28364263&loc=d3e13433-108611 + Details
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