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Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total cash and cash equivalents | $ 328,384 | $ 181,792 | $ 146,766 | $ 203,035
Amortized Cost | 360,988 | 503,731 |  |
Gross unrealized holding losses | (43) | (228) |  |
Marketable securities | 360,945 | 503,503 |  |
Total Assets Measured at Fair Value - Amortized cost | 689,372 | 685,523 |  |
Total cash and cash equivalents and available for sale securities, fair market value | $ 689,329 | 685,295 |  |
Marketable Securities |  |  |  |
Maximum period for redemption | 1 year |  |  |
Bonds and bond funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 229,825 | 344,479 |  |
Gross unrealized holding losses | (42) | (228) |  |
Marketable securities | 229,783 | 344,251 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 131,163 | 159,252 |  |
Gross unrealized holding losses | (1) |  |  |
Marketable securities | $ 131,162 | $ 159,252 |  |

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