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Leases (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) lease item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Leases |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | false |  |
Operating lease liabilities | $ 11,391 |  |
Operating lease costs | 13,496 | $ 10,666 | $ 9,723
Non-cancelable operating lease commitments not yet commenced | $ 23,758 |  |
Number of off-campus classroom and laboratory sites | item | 5 |  |
Optical fiber communication lines not yet commenced | $ 192 |  |
Weighted-average remaining lease term | 8 years 7 days |  |
Weighted-average discount rate of operating leases | 3.88% |  |
Number of financing leases | lease | 0 |  |
Minimum |  |  |
Leases |  |  |
Term of operating leases | 5 months |  |
Maximum |  |  |
Leases |  |  |
Term of operating leases | 10 years 5 months |  |

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- Definition The amount of noncancelable operating lease commitments not yet commenced as of the reporting date. + References No definition available. + Details
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- Definition The number of financing leases maintained by the entity. + References No definition available. + Details
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- Definition The number of off-campus classroom and laboratory sites. + References No definition available. + Details
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- Definition The amount of optical fiber communication lines not yet commenced as of the reporting date. + References No definition available. + Details
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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