v3.8.0.1
Grants and other liabilities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Type
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Oct. 02, 2013
USD ($)
Grants and other liabilities [Abstract]        
Grants $ 1,197,683   $ 1,225,877  
Other liabilities 478,516   410,183  
Grant and other non-current liabilities $ 1,676,199   1,636,060  
Number of grant types | Type 2      
Solana and Mojave [Member]        
Grants and other liabilities [Abstract]        
Income from grants $ 14,900 $ 15,000    
U.S. Department of Treasury [Member]        
Grants and other liabilities [Abstract]        
Grants 763,000   771,000  
Federal Financing Bank [Member]        
Grants and other liabilities [Abstract]        
Grants 432,000   452,000  
Liberty Interactive Corporation [Member]        
Grants and other liabilities [Abstract]        
Grant and other non-current liabilities 357,000   $ 352,000  
Class A membership investment       $ 300,000
Finance lease liabilities $ 60,000