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Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total cash and cash equivalents | $ 215,723 | $ 87,206 | $ 328,384 | $ 181,792
Amortized Cost | 610,185 | 432,966 |  |
Fair market value | 610,185 | 432,966 |  |
Total Assets Measured at Fair Value - Amortized cost | 825,908 | 520,172 |  |
Total cash and cash equivalents and available for sale securities, fair market value | $ 825,908 | 520,172 |  |
Marketable Securities |  |  |  |
Maximum period for redemption | 1 year |  |  |
Bonds and bond funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 117,928 | 267,243 |  |
Fair market value | 117,928 | 267,243 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 492,257 | 165,723 |  |
Fair market value | $ 492,257 | $ 165,723 |  |

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