(2) Investments

As of December 31, 2013 and 2012, we held certain investments that were required to be measured for disclosure purposes at fair value on a recurring basis. These investments were considered Level 2 investments. We consider as current assets those investments which will mature in the next 12 months. The remaining investments are considered non-current assets.

The amortized cost and fair value of our investments that are being accounted for as held-to-maturity securities, and the related gross unrealized gains and losses, were as follows as of the dates shown below (in thousands):

			Gross Unrealized
	Cost		Gains		Losses		Fair value
As of December 31, 2013:
Short-term Investments:
Corporate bonds	$	18,351	$	234	$	—	$	18,585

Long-term Investments:
Corporate bonds	$	10,069	$	285	$	—	$	10,354

As of December 31, 2012:
Short-term Investments:
Corporate bonds	$	8,182	$	78	$	—	$	8,260
Long-term Investments:
Corporate bonds	$	28,433	$	652	$	29	$	29,056

At December 31, 2013, the length of time until maturity of these securities ranged from five to 16 months.