(2) Investments

As of December 31, 2011 and 2010, 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, 2011:
Short-term Investments:
Corporate bonds	$	20,279	$	44	$	8	$	20,315

Long-term Investments:
Corporate bonds	$	10,336		—	$	55	$	10,281

As of December 31, 2010:
Short-term Investments:
Corporate bonds	$	10,715	$	178		—	$	10,893
Long-term Investments:
Corporate bonds	$	20,291	$	602		—	$	20,893

At December 31, 2011, the length of time until maturity of these securities ranged from three to 34 months.