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Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Marketable Securities |  |  |  |
Total cash and cash equivalents | $ 181,792 | $ 146,766 | $ 203,035 | $ 132,275
Amortized Cost | 503,731 | 410,014 |  |
Gross unrealized holding losses | (228) | (116) |  |
Marketable securities | 503,503 | 409,898 |  |
Total Assets Measured at Fair Value - Amortized cost | 685,523 | 556,780 |  |
Total cash and cash equivalents and available for sale securities, fair market value | $ 685,295 | 556,664 |  |
Marketable Securities |  |  |  |
Maximum period for redemption | 1 year |  |  |
Bonds and bond funds |  |  |  |
Marketable Securities |  |  |  |
Amortized Cost | $ 344,479 | 410,001 |  |
Gross unrealized holding losses | (228) | (116) |  |
Marketable securities | 344,251 | 409,885 |  |
Commercial paper |  |  |  |
Marketable Securities |  |  |  |
Amortized Cost | 159,252 | 13 |  |
Marketable securities | $ 159,252 | $ 13 |  |

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