Note 7 — Available-for-sale debt securities

As of March 31, 2018, the Company has the following investments in available-for-sale debt securities (in thousands):

In the three months ended March 31, 2018, realized losses recognized on the maturity of available-for-sale debt securities of $1,163,000, primarily arising due to foreign exchange movements, were reclassified out of accumulated other comprehensive loss.

As of March 31, 2018 and December 31, 2017, the aggregate fair value of securities held by the Company in an unrealized loss position was $110,979,000 and $125,828,000, respectively, which consisted of 46 and 54 securities, respectively.  No securities have been in an unrealized loss position for more than one year. As of March 31, 2018, these securities are not considered to be other than temporarily impaired because the impairments are not severe, have been for a short duration and are due to normal market and exchange rate fluctuations. Furthermore, the Company does not intend to sell the debt securities in an unrealized loss position and it is unlikely that the Company will be required to sell these securities before the recovery of the amortized cost.