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Nature of Operations and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Maturities of marketable securities |  |  |  |
Year 2016 | $ 231,298 |  |  |
Years 2017 through 2020 | 55,370 |  |  |
Marketable securities | $ 286,700 | $ 415,300 |  |
Maximum period for redemption | 1 year |  |  |
Investment as non-current | $ 2,300 | 2,300 |  |
Total cash and cash equivalents | 203,035 | 132,275 | $ 170,636 | $ 133,772
Amortized Cost | 286,887 | 415,726 |  |
Gross unrealized holding gains | 1 | 12 |  |
Gross unrealized holding losses | (220) | (465) |  |
Marketable securities | 286,668 | 415,273 |  |
Total cash and cash equivalents and available for sale securities, amortized cost | 489,922 | 548,001 |  |
Total cash and cash equivalents and available for sale securities, fair market value | 489,703 | 547,548 |  |
Bonds and bond funds |  |  |  |
Maturities of marketable securities |  |  |  |
Amortized Cost | 286,857 | 410,618 |  |
Gross unrealized holding gains |  | 9 |  |
Gross unrealized holding losses | (220) | (464) |  |
Marketable securities | 286,637 | 410,163 |  |
Asset-backed Securities |  |  |  |
Maturities of marketable securities |  |  |  |
Amortized Cost | 30 | 5,108 |  |
Gross unrealized holding gains | 1 | 3 |  |
Gross unrealized holding losses |  | (1) |  |
Marketable securities | $ 31 | $ 5,110 |  |

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