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Non-controlling Interests (Details) - USD ($) $ in Thousands |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 16, 2020 | Sep. 01, 2020 | May 28, 2019 | Jun. 30, 2020 | Dec. 31, 2020 | May 31, 2015
Passport | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, increase from business combination |  | $ 25,700 |  |  |  |
Interest in investment | 30.00% | 30.00% | 30.00% |  |  |
Requirement to acquire ownership, consideration, amount |  | $ 20,000 |  |  |  |
Gain on consolidation |  |  |  |  | $ 5,700 |
Non-Controlling Interests |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |
Non-controlling interests balance as of beginning of period |  |  |  | $ 6,889 | $ 6,889 |
Reclassification of non-controlling interests |  |  |  | (6,889) |  |
Non-controlling interests balance as of end of period |  |  |  | $ 0 |  |
Evolent Health LLC |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Parent's ownership percentage |  |  |  |  |  | 70.30%

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