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Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash and cash equivalents | $ 258,421 | $ 215,723
Amortized Cost | 601,989 | 610,185
Fair market value | 601,989 | 610,185
Total Assets Measured at Fair Value - Amortized cost | 860,410 | 825,908
Total cash and cash equivalents and available for sale securities, fair market value | $ 860,410 | 825,908
Marketable Securities |  |
Maximum period for redemption | 1 year |
Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 54,673 | 117,928
Fair market value | 54,673 | 117,928
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 547,316 | 492,257
Fair market value | $ 547,316 | $ 492,257

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