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

X

- 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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Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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