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Goodwill and Intangible Assets, Net - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 399,906 |  | $ 399,906 |  | $ 398,034
Accumulated Amortization | 147,861 |  | 147,861 |  | 133,042
Total future amortization of intangible assets | 252,045 |  | 252,045 |  | 264,992
Amortization of intangible assets | 7,200 | $ 8,400 | $ 14,700 | $ 17,700 |
Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net |  |  |  |  | $ 3,080
Amortization of intangible assets |  | $ 200 |  | $ 300 |
Corporate trade name |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  | 12 years 8 months 12 days |  | 13 years 2 months 12 days
Gross Carrying Amount | 23,300 |  | $ 23,300 |  | $ 23,300
Accumulated Amortization | 6,961 |  | 6,961 |  | 6,271
Total future amortization of intangible assets | 16,339 |  | $ 16,339 |  | $ 17,029
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  | 15 years 8 months 12 days |  | 16 years 2 months 12 days
Gross Carrying Amount | 278,519 |  | $ 278,519 |  | $ 278,519
Accumulated Amortization | 64,894 |  | 64,894 |  | 57,716
Total future amortization of intangible assets | 213,625 |  | $ 213,625 |  | $ 220,803
Customer relationships | Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  |  |  | 15 years
Intangible assets, net |  |  |  |  | $ 2,200
Technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  | 1 year 3 months 18 days |  | 1 year 9 months 18 days
Gross Carrying Amount | 82,922 |  | $ 82,922 |  | $ 82,922
Accumulated Amortization | 68,809 |  | 68,809 |  | 63,507
Total future amortization of intangible assets | 14,113 |  | $ 14,113 |  | $ 19,415
Below market lease, net |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  | 1 year 9 months 18 days |  | 2 years 3 months 18 days
Gross Carrying Amount | 1,218 |  | $ 1,218 |  | $ 1,118
Accumulated Amortization | 849 |  | 849 |  | 648
Total future amortization of intangible assets | 369 |  | $ 369 |  | $ 470
Provider network contracts |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  | 2 years 6 months |  | 2 years 10 months 24 days
Gross Carrying Amount | 13,947 |  | $ 13,947 |  | $ 12,175
Accumulated Amortization | 6,348 |  | 6,348 |  | 4,900
Total future amortization of intangible assets | $ 7,599 |  | $ 7,599 |  | $ 7,275
Provider network contracts | Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted- Average Remaining Useful Life |  |  |  |  | 10 months
Intangible assets, net |  |  |  |  | $ 900

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