Marketable Securities

Marketable securities consist primarily of certificates of deposit and corporate bonds with maturities greater than three months and up to ten years at the time of purchase as well as marketable equity securities. These securities, which are classified as available-for-sale, are carried at fair value, with unrealized gains and losses, net of any tax effect, reported in stockholders’ equity as accumulated other comprehensive income (loss). These securities are classified as current and non-current marketable securities based upon their maturities. Amortization of premiums and discounts is included in interest income. For the three and nine months ended September 30, 2016, the amortization of bond premiums totaled $307 and $925 compared to $347 and $1,040 for the comparable period in 2015. The values of these securities may fluctuate as a result of changes in equity values, market interest rates and credit risk. The schedule of maturities at September 30, 2016 and December 31, 2015 are as follows:



	Maturities as of September 30, 2016				Maturities as of December 31, 2015
	1 Year or Less		1 to 10 Years		1 Year or Less		1 to 10 Years
Corporate bonds	$	11,628	$	90,436	$	11,240	$	88,465
Certificates of deposit	18,673		—		21,184		—
Total	$	30,301	$	90,436	$	32,424	$	88,465

For the three and nine months ended September 30, 2016, gains of $3 and losses of $776 were reclassified from accumulated other comprehensive income and recognized in the income statement in other income compared to losses of $14 and gains of $82 for the comparable periods in 2015. For the nine month period ended September 30, 2016, current marketable securities included unrealized losses of $350 and long-term marketable securities included unrealized gains of $939 and unrealized losses of $35. For the comparable period in 2015, current marketable securities included unrealized losses of $640 while long-term marketable securities included unrealized gains of $151 and unrealized losses of $962.