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Income Taxes - Tax Effects of Temporary Differences That Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax liabilities: |  |  |
Property, plant and equipment | $ 19,606 | $ 1,359 |
Right-of-use-assets | 33,449 | 9,402 |
Goodwill | 33,354 | 31,629 |
Intangible assets | 1,201,086 | 13,398 |
Other | 1,761 | 1,009 |
Total deferred tax liabilities recognized | 1,289,256 | 56,797 |
Deferred tax assets: |  |  |
Operating loss and tax credits carryforwards | 86,893 | 42,794 |
Property, plant and equipment | 5,846 | 6,040 |
Lease liabilities | 36,106 | 9,394 |
Intangible assets | 4,596 | 0 |
Accrued expenses and unbilled revenue | 69,198 | 24,368 |
Stock compensation | 25,557 | 3,672 |
Deferred compensation | 3,445 | 3,184 |
Unearned revenue | 64,924 | 2,257 |
Other | 602 | 155 |
Total deferred tax assets | 297,167 | 91,864 |
Valuation allowance for deferred tax assets | (45,495) | (32,768) | $ (27,700)
Deferred tax assets recognized | 251,672 | 59,096 |
Overall net deferred tax asset/(liability) | $ (1,037,584) |  |
Overall net deferred tax asset/(liability) |  | $ 2,299 |

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