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

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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



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-Publisher FASB

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-Section 50

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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)

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 210

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 13

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+ References

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-Topic 210

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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