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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 |

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- 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 + Details
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- 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 + Details
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