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Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities, current: |  |
Debt securities, current | $ 948,677 | $ 0
Investment securities, non-current: |  |
Debt securities, noncurrent | 39,650 | 37,273
Prepaid expenses and other current assets |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 1,600 | 900
Derivative asset | 100 |
Other assets |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 9,700 | 8,700
Derivative asset | 14,900 |
Corporate debt securities |  |
Investment securities, current: |  |
Debt securities, current | 351,843 |
Municipal bonds |  |
Investment securities, current: |  |
Debt securities, current | 31,168 |
Investment securities, non-current: |  |
Debt securities, noncurrent | 3,108 | 197
Asset-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 120,211 |
Investment securities, non-current: |  |
Debt securities, noncurrent | 168 | 210
Mortgage-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 138,260 |
Investment securities, non-current: |  |
Debt securities, noncurrent | 123 | 138
Pooled investment fund measured at net asset value |  |
Investment securities, non-current: |  |
Debt securities, noncurrent | 9,000 | 9,000
Interest rate swaps | Other current liabilities |  |
Liabilities: |  |
Derivative liability | 17,600 | 22,000
Interest rate swaps | Other liabilities |  |
Liabilities: |  |
Derivative liability | 2,400 | 22,900
Level 1 |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 11,303 | 9,586
Level 1 | Money market funds |  |
Financial Assets: |  |
Money market funds | 3,670 | 335,449
Level 1 | Fixed-income mutual fund |  |
Investment securities, non-current: |  |
Debt securities, noncurrent | 27,251 | 27,728
Level 2 | US Treasury Securities |  |
Investment securities, current: |  |
Debt securities, current | 307,195 | 0
Level 2 | Corporate debt securities |  |
Investment securities, current: |  |
Debt securities, current | 351,843 | 0
Level 2 | Municipal bonds |  |
Investment securities, current: |  |
Debt securities, current | 31,168 | 0
Investment securities, non-current: |  |
Debt securities, noncurrent | 3,108 | 197
Level 2 | Asset-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 120,211 | 0
Investment securities, non-current: |  |
Debt securities, noncurrent | 168 | 210
Level 2 | Mortgage-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 138,260 | 0
Investment securities, non-current: |  |
Debt securities, noncurrent | 123 | 138
Level 2 | Interest rate swaps |  |
Investment securities, non-current: |  |
Derivative asset | 15,031 | 0
Liabilities: |  |
Derivative liability | 19,982 | 44,938
Level 3 | Derivative |  |
Liabilities: |  |
Derivative liability | 67,300 | 0
Net Asset Value | Pooled investment fund measured at net asset value |  |
Investment securities, non-current: |  |
Debt securities, noncurrent | $ 9,000 | $ 9,000

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