Fair Value Measurements - Assets and liabilities measured at fair value on a recurring basis (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Level 1 | Swaps and Forward Contracts
Fair Value
Liabilities, Fair value		$ 981
Level 1 | Cash and cash equivalents
Fair Value
Assets, Fair Value	$ 212,577	115,241
Level 1 | U.S. Treasuries
Fair Value
Assets, Fair Value	1,139,310	1,013,883
Level 1 | Equity securities
Fair Value
Assets, Fair Value	134,836	147,995
Level 1 | Swaps and Forward Contracts
Fair Value
Assets, Fair Value		70
Level 2 | Corporate bonds
Fair Value
Assets, Fair Value	193,633	226,382
Level 3 | Contingent consideration
Fair Value
Liabilities, Fair value	116,165	62,297
Carrying value | Contingent consideration
Fair Value
Liabilities, Fair value	116,165	62,297
Carrying value | Swaps and Forward Contracts
Fair Value
Liabilities, Fair value		981
Carrying value | Cash and cash equivalents
Fair Value
Assets, Fair Value	212,577	115,241
Carrying value | Corporate bonds
Fair Value
Assets, Fair Value	193,633	226,382
Carrying value | U.S. Treasuries
Fair Value
Assets, Fair Value	1,139,310	1,013,883
Carrying value | Equity securities
Fair Value
Assets, Fair Value	134,836	147,995
Carrying value | Swaps and Forward Contracts
Fair Value
Assets, Fair Value		70
Fair value | Contingent consideration
Fair Value
Liabilities, Fair value	116,165	62,297
Fair value | Swaps and Forward Contracts
Fair Value
Liabilities, Fair value		981
Fair value | Cash and cash equivalents
Fair Value
Assets, Fair Value	212,577	115,241
Fair value | Corporate bonds
Fair Value
Assets, Fair Value	193,633	226,382
Fair value | U.S. Treasuries
Fair Value
Assets, Fair Value	1,139,310	1,013,883
Fair value | Equity securities
Fair Value
Assets, Fair Value	$ 134,836	147,995
Fair value | Swaps and Forward Contracts
Fair Value
Assets, Fair Value		$ 70