Fair Value Measurements - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Assets, Carrying Amount	$ 5,950,076	$ 2,251,282
Liabilities, Carrying amount	1,344,380	784,363
Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value	62,297	9,760
Recurring basis | Convertible senior notes
Fair Value
Liabilities, Fair value	1,129,765	1,272,766
Recurring basis | Long-term debt
Fair Value
Liabilities, Fair value	129,437	175,402
Recurring basis | Finance obligations
Fair Value
Liabilities, Fair value	253,684	181,553
Recurring basis | Swaps and Forward Contracts
Fair Value
Liabilities, Fair value	981
Recurring basis | Cash and cash equivalents
Fair Value
Assets, Fair Value	115,241
Recurring basis | Corporate bonds
Fair Value
Assets, Fair Value	226,382
Recurring basis | U.S. Treasuries
Fair Value
Assets, Fair Value	1,013,883
Recurring basis | Equity securities
Fair Value
Assets, Fair Value	147,995
Recurring basis | Swaps and Forward Contracts
Fair Value
Assets, Fair Value	70
Recurring basis | Level 1 | Swaps and Forward Contracts
Fair Value
Liabilities, Fair value	981
Recurring basis | Level 1 | Cash and cash equivalents
Fair Value
Assets, Fair Value	115,241
Recurring basis | Level 1 | U.S. Treasuries
Fair Value
Assets, Fair Value	1,013,883
Recurring basis | Level 1 | Equity securities
Fair Value
Assets, Fair Value	147,995
Recurring basis | Level 1 | Swaps and Forward Contracts
Fair Value
Assets, Fair Value	70
Recurring basis | Level 2 | Convertible senior notes
Fair Value
Liabilities, Fair value	1,129,765	1,272,766
Recurring basis | Level 2 | Corporate bonds
Fair Value
Assets, Fair Value	226,382
Recurring basis | Level 3 | Contingent consideration
Fair Value
Liabilities, Fair value	62,297	9,760
Recurring basis | Level 3 | Long-term debt
Fair Value
Liabilities, Fair value	129,437	175,402
Recurring basis | Level 3 | Finance obligations
Fair Value
Liabilities, Fair value	253,684	181,553
Carrying value | Contingent consideration
Fair Value
Liabilities, Carrying amount	62,297	9,760
Carrying value | Convertible senior notes
Fair Value
Liabilities, Carrying amount	192,633	85,640
Carrying value | Long-term debt
Fair Value
Liabilities, Carrying amount	128,046	175,402
Carrying value | Finance obligations
Fair Value
Liabilities, Carrying amount	253,684	$ 181,553
Carrying value | Swaps and Forward Contracts
Fair Value
Liabilities, Carrying amount	981
Carrying value | Cash and cash equivalents
Fair Value
Assets, Carrying Amount	115,241
Carrying value | Corporate bonds
Fair Value
Assets, Carrying Amount	226,382
Carrying value | U.S. Treasuries
Fair Value
Assets, Carrying Amount	1,013,883
Carrying value | Equity securities
Fair Value
Assets, Carrying Amount	147,995
Carrying value | Swaps and Forward Contracts
Fair Value
Assets, Carrying Amount	$ 70