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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