Revenue Recognition - Revenues Disaggregated by Revenue Source and Market (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 165,236	$ 146,815	$ 479,302	$ 462,950
Commercial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	87,001	69,711	250,064	225,014
State
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	62,233	62,830	195,046	189,752
Federal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	16,002	14,274	34,192	48,184
Coordination of Benefits
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	113,870	94,619	338,661	305,564
Payment Integrity
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	37,987	37,016	101,704	113,863
Population Health Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 13,379	$ 15,180	$ 38,937	$ 43,523