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Income taxes - Net Operating Losses Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 1,470,251	$ 1,306,482
Expiration dates	Dec. 31, 2028
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 2,094,687	2,078,105
Expiration dates	Dec. 31, 2027
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 466,743	$ 446,234
Iceland [Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	Dec. 31, 2017
Netherlands [Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	Dec. 31, 2022

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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X

- Definition

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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