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v2.4.1.9

Offsetting of financial assets and liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Asset, Gross amounts of assets | $ 12,324 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 15,217 us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Asset, Gross amounts offset in the consolidated balance sheet | 0 us-gaap_DerivativeAssetFairValueGrossLiability | 0 us-gaap_DerivativeAssetFairValueGrossLiability
Derivative Asset, Net amount of assets presented in the consolidated balance sheet | 12,324 us-gaap_DerivativeAssets | 15,217 us-gaap_DerivativeAssets
Derivative, Gross amounts not offset in the balance sheet, Financial instruments | 0 us-gaap_DerivativeCollateralObligationToReturnSecurities | 0 us-gaap_DerivativeCollateralObligationToReturnSecurities
Derivative, Gross amounts not offset in the balance sheet, Cash collateral received | 0 us-gaap_DerivativeCollateralObligationToReturnCash | (1,050)us-gaap_DerivativeCollateralObligationToReturnCash
Derivative Asset, Gross amounts not offset in the balance sheet, Net amount | 12,324 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 14,167 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Designated as Hedging Instrument [Member] |  |
Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Asset, Gross amounts of assets | 12,324 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 15,217 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative Asset, Gross amounts offset in the consolidated balance sheet | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative Asset, Net amount of assets presented in the consolidated balance sheet | $ 12,324 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 15,217 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition Fair value of liability associated with 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 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&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=35706170&loc=SL5624163-113959 + 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: 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=34720828&loc=SL20225862-175312 Reference 5: 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 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=36459792&loc=SL20226008-175313 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=34720828&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 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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