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Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total cash and cash equivalents | $ 87,206 | $ 328,384 | $ 181,792 | $ 146,766
Amortized Cost | 432,966 | 360,988 |  |
Gross unrealized holding losses |  | (43) |  |
Fair market value | 432,966 | 360,945 |  |
Total Assets Measured at Fair Value - Amortized cost | 520,172 | 689,372 |  |
Total cash and cash equivalents and available for sale securities, fair market value | $ 520,172 | 689,329 |  |
Marketable Securities |  |  |  |
Maximum period for redemption | 1 year |  |  |
Bonds and bond funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 267,243 | 229,825 |  |
Gross unrealized holding losses |  | (42) |  |
Fair market value | 267,243 | 229,783 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 165,723 | 131,163 |  |
Gross unrealized holding losses |  | (1) |  |
Fair market value | $ 165,723 | $ 131,162 |  |

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