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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss and other carryforwards | $ 15,762 | $ 19,513 |  |
Tax credit carryforwards | 4,743 | 4,222 |  |
Accrued expenses | 14,629 | 10,702 |  |
Allowance for bad debt | 2,003 | 1,445 |  |
Share-based compensation expense | 6,097 | 3,885 |  |
Operating lease liabilities | 6,320 | 16,756 |  |
Basis difference in fixed assets | 22,191 | 14,642 |  |
Deferred revenue | 2,420 | 2,994 |  |
State taxes | 1,974 | 4,447 |  |
Other | 2,468 | 3,920 |  |
Deferred tax assets, gross | 78,607 | 82,526 |  |
Less: valuation allowance | (1,720) | (1,699) | $ (1,812) | $ (8,262)
Total deferred tax assets | 76,887 | 80,827 |  |
Deferred tax liabilities: |  |  |  |
Operating lease right-of-use assets | (4,618) | (14,008) |  |
Basis difference in intangible assets | (86,712) | (101,797) |  |
Unrealized gains on investments | (13,512) | (24,123) |  |
Prepaid insurance | (2,835) | (2,744) |  |
Other | (5,982) | (8,639) |  |
Total deferred tax liabilities | (113,659) | (151,311) |  |
Net deferred tax liabilities | $ (36,772) | $ (70,484) |  |

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