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Income taxes Changes in Valuation Allowance (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Valuation Allowance [Line Items] |  |
Balance, valuation allowance | $ 765,023 us-gaap_ValuationAllowancesAndReservesBalance | $ 656,352 us-gaap_ValuationAllowancesAndReservesBalance
Change in valuation allowance | (16,740)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 108,671 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Balance, valuation allowance | $ 748,283 us-gaap_ValuationAllowancesAndReservesBalance | $ 765,023 us-gaap_ValuationAllowancesAndReservesBalance

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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