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Income taxes Reconciliation of statutory to effective income tax rate (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal Statutory Rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Permanent differences	4.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	54.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	12.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
State taxes, net of Federal benefit	(6.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	97.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign earnings taxed at different rates than U.S.	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	17.40%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(369.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Valuation allowance	(25.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(265.90%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	297.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Changes in uncertain tax reserves	0.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	40.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	(6.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Other	6.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	13.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	14.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(7.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	(30.40%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

+ References

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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