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Income taxes Additional income tax details (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2014
Income Tax Disclosure [Abstract]
Reduction in reserve for unrecognized tax benefits related to prior years	$ 14,300us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Proceeds from income tax refunds	5,009us-gaap_ProceedsFromIncomeTaxRefunds
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 1,287,118us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember	[1]	$ 1,306,482us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember	[1]
[1] The federal NOL begins to expire in 2028.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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The amount of cash received during the period as refunds for the overpayment of taxes.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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