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Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Accounting Policies |  |  |
Depreciation expenses | $ 39.2 | $ 33.2 | $ 32.8
Office building |  |  |
Significant Accounting Policies |  |  |
Estimated useful lives of assets | 45 years |  |
Office building related facilities |  |  |
Significant Accounting Policies |  |  |
Estimated useful lives of assets | 20 years |  |
Computers and equipment | Minimum |  |  |
Significant Accounting Policies |  |  |
Estimated useful lives of assets | 3 years |  |
Computers and equipment | Maximum |  |  |
Significant Accounting Policies |  |  |
Estimated useful lives of assets | 4 years |  |
Furniture and fixtures |  |  |
Significant Accounting Policies |  |  |
Estimated useful lives of assets | 5 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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