|9 Months Ended|
Sep. 30, 2011
|Available-For-Sale Investments [Abstract]|
4. AVAILABLE-FOR-SALE INVESTMENTS
The following is a summary of our available-for-sale investments as of September 30, 2011 and December 31, 2010 (in thousands):
Realized gains and losses and declines in value, judged to be other than temporary, on available-for-sale securities are included in other income (expense) for the three-months ended September 30, 2011 and 2010. Realized gains were calculated based on the specific identification method and were not material for each of the three- and nine-months ended September 30, 2011 and were approximately $0.6 million for the nine-months ended September 30, 2010, consisting primarily of realized gains from the sale of auction rate securities. Unrealized holding gains and losses on securities classified as available-for-sale are recorded in accumulated other comprehensive income.
The following is a summary of the amortized cost and estimated fair value of available-for-sale securities at September 30, 2011 by contractual maturity (in thousands):