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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets- |  |
Accounts receivable and allowance for doubtful accounts | $ 3,203 | $ 2,530
Stock-based compensation | 4,549 | 3,809
Accrued liabilities and expenses | 44,209 | 34,179
Lease liabilities | 51,065 | 32,048
Net operating loss carryforwards | 5,877 | 5,361
Intangible assets | 8,570 | 9,204
Research and experimental expenditures | 195,444 | 106,002
Other | 1,234 | 539
Subtotal | 314,151 | 193,672
Valuation allowances | (156) | (379)
Total deferred tax assets | 313,995 | 193,293
Deferred tax liabilities- |  |
Property and equipment | (27,049) | (18,882)
Lease right-of-use asset | (51,058) | (32,025)
Long-term contracts | (193,144) | (1,870)
Goodwill | (24,452) | (23,288)
Other | (1,689) | (1,563)
Total deferred tax liabilities | (297,392) | (77,628)
Net deferred tax assets | 16,603 | 115,665
Deferred income tax assets |  |
Deferred tax assets | 17,723 | $ 115,665
Deferred tax liabilities | $ 1,120 |

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