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Income taxes Net Operating Losses Carryforwards (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Federal [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2028  
Operating Loss Carryforwards $ 1,306,482us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 [1] $ 1,287,118us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 [1]
State [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2027  
Operating Loss Carryforwards 2,078,105us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 [2] 2,077,890us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 [2]
Foreign [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 446,234us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 [3] $ 459,457us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 [3]
Iceland [Member] | Foreign [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2017  
Netherlands [Member] | Foreign [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2022  
[1] The federal NOL begins to expire in 2028.
[2] The state NOLs begin to expire in 2027.
[3] The Icelandic NOL begins to expire in 2017; Dutch NOL begins to expire in 2022.