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Income taxes Net Operating Losses Carryforwards (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Internal Revenue Service (IRS) [Member]
    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2028  
Operating Loss Carryforwards $ 1,287,118 [1] $ 1,176,802 [1]
State and Local Jurisdiction [Member]
    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2027  
Operating Loss Carryforwards 2,077,890 [2] 1,106,961 [2]
Foreign Tax Authority [Member]
    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 459,457 [3] $ 341,290 [3]
Iceland [Member] | Foreign Tax Authority [Member]
    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2017  
Netherlands [Member] | Foreign Tax Authority [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.