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 | |||