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Operations and Summary of Significant Accounting Policies - Additional Information (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 2 |  |
Cash |  |  |  | $ 22,308,000 | $ 25,246,000 |
Cash equivalents |  |  |  | 15,008,000 | 15,008,000 |
Average monthly revenue adjustments |  |  |  | 662,000 |  |
Average monthly revenue |  |  |  | $ 138,536,000 |  |
Average monthly revenue adjustments as a percentage of monthly revenue |  |  |  | 0.50% |  |
Property and Equipment |  |  |  |  |  |
Capitalized computer software, net |  |  |  | $ 8,140,000 | 7,455,000 |
Capitalized computer software, amortization |  |  |  | 2,394,000 | 2,053,000 | $ 1,714,000
Long-lived asset impairment | $ 0 | $ 0 | $ 0 |  |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  |  |
Goodwill accumulated impairment |  |  |  | 25,686,000 |  |
Goodwill tax deductible |  |  |  | 187,608,000 |  |
Amortization |  |  |  | 14,328,000 | 13,489,000 | 10,183,000
Intangible assets, estimated future amortization |  |  |  |  |  |
2022 |  |  |  | 16,018,000 |  |
2023 |  |  |  | 15,779,000 |  |
2024 |  |  |  | 15,655,000 |  |
2025 |  |  |  | 15,557,000 |  |
2026 |  |  |  | 15,366,000 |  |
Liability insurance coverage |  |  |  | 100,000 |  |
Self-insurance retention workers' compensation |  |  |  | 500,000 |  |
Self insurance reserve |  |  |  | 65,649,000 | 68,647,000 |
Self insurance reserves, current |  |  |  | 21,172,000 | 17,994,000 |
Self insurance reserve, noncurrent |  |  |  | 44,477,000 | 50,653,000 |
Insurance settlements receivable |  |  |  | 28,667,000 | 35,088,000 |
Net income allocated to participating securities |  |  |  | $ 737,000 | 385,000 | $ 945,000
Share-based awards, vesting period |  |  |  | 3 years |  |
Other operating expenses |  |  |  | $ 434,000 | $ 1,560,000 |
Employee Stock Option |  |  |  |  |  |
Intangible assets, estimated future amortization |  |  |  |  |  |
Share-based awards, vesting period |  |  |  | 3 years |  |
Performance Shares |  |  |  |  |  |
Intangible assets, estimated future amortization |  |  |  |  |  |
Share-based awards, vesting period |  |  |  | 3 years |  |
Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Capitalized computer software, amortization period |  |  |  | 3 years |  |
Estimated useful lives |  |  |  | 20 years |  |
Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Capitalized computer software, amortization period |  |  |  | 5 years |  |
Estimated useful lives |  |  |  | 1 year |  |
Buildings and improvements | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 30 years |  |
Buildings and improvements | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 40 years |  |
Equipment | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 3 years |  |
Equipment | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 10 years |  |
Computer software |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 5 years |  |

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