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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 18, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Maturity period (less than) |  |  |  | 10 years |  |
Average maturity period (less than) |  |  |  | 10 years |  |
Interest receivable |  | $ 9,000 |  | $ 9,000 |  | $ 12,000
Risk adjustment payable |  | 265,000 |  | 265,000 |  | 368,000
Risk adjustment receivable |  | 59,000 |  | 59,000 |  | 63,000
Risk adjustment, net payable |  | 206,000 |  | 206,000 |  | $ 305,000
Risk adjustment, net payable, current year |  | 230,000 |  | 230,000 |  |
Risk adjustment, net payable, prior year |  | 24,000 |  | 24,000 |  |
HIF liabilities |  | 277,000 |  | 277,000 | $ 271,000 |
Increase in HIF liabilities |  |  | $ 6,000 |  |  |
COVID-19 [Member] |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Reduction in premiums |  | 88,000 | $ 75,000 | 163,000 |  |
Medicaid | PUERTO RICO |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Premium deficiency reserve |  | $ 10,000 |  | $ 10,000 |  |
Maine Community Health Options v. United States |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Summary judgement | $ 128,100 |  |  |  |  |

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