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Revenue (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Accounting Estimate [Line Items]        
Total revenue   $ 538,199 $ 582,774 $ 506,201
Net commission revenue adjustments from members approved in prior period        
Change in Accounting Estimate [Line Items]        
Total revenue [1],[2]   21,739 38,769 81,295
Net commission revenue adjustments from members approved in prior period | Medicare Advantage        
Change in Accounting Estimate [Line Items]        
Total revenue $ 50,800      
Medicare Segment | Net commission revenue adjustments from members approved in prior period        
Change in Accounting Estimate [Line Items]        
Total revenue [2]   (8,414) 5,665 55,292
Increase (decrease) in revenue   (28,800) (17,300) (3,100)
Individual, Family and Small Business | Net commission revenue adjustments from members approved in prior period        
Change in Accounting Estimate [Line Items]        
Total revenue [2]   $ 30,153 $ 33,104 $ 26,003
[1] The impact of total net commission revenue from members approved in prior periods was $0.81, $1.49 and $3.52 per basic share, respectively, or $0.81, $1.44 and $3.31 per diluted share, respectively, for the years ended December 31, 2021, 2020 and 2019, respectively. The total reductions to revenue from members approved in prior periods were $28.8 million, $17.3 million and $3.1 million for the years ended December 31, 2021, 2020 and 2019, respectively. These reductions to revenue primarily related to the Medicare segment.
[2] These amounts reflect our revised estimates of cash collections for certain members approved prior to the relevant reporting period that are recognized as adjustments to revenue within the relevant reporting period. The net adjustment revenue includes both increases in revenue for certain prior period cohorts as well as reductions in revenue for certain prior period cohorts.