NOTE 4 — SECURITIES

Investment securities, available for sale

The following table presents investment securities, available for sale as of:

(Dollars in thousands)	September 30, 2013					December 31, 2012
Corporate bonds	$		—			$		3,060
Investment securities, available for sale	$		—			$		3,060

The amortized cost and gross unrealized holding gains for investment securities, available for sale, consisted of the following as of:

(Dollars in thousands)	September 30, 2013		December 31, 2012
Amortized cost	$	—	$	2,836
Gross unrealized holding gains		—		224
Estimated fair value	$	—	$	3,060

In March 2013, the Company sold its remaining corporate bond position for $3.2 million and recognized a $0.4 million gain on sale of investment securities, available for sale. There were no individual investment securities with unrealized holding losses at December 31, 2012. No credit-related other-than-temporary impairment was recognized on investment securities, available for sale in the three or nine months ended September 30, 2013, and zero and $0.6 million was recognized in the three and nine months ended September 30, 2012, respectively.

Nonmarketable equity securities

The Company classifies nonmarketable equity securities in other noncurrent assets, or other current assets when the securities are held for sale, and are carried at the lower of cost or market. As of September 30, 2013, the Company held convertible preferred stock in a private company with which the Company has a commercial lending relationship, and common stock the Company received in exchange for its position in a private company’s defaulted corporate bonds pursuant to the issuer’s plan of reorganization in bankruptcy.

The following table presents the carrying value of nonmarketable equity securities as of:

(Dollars in thousands)	September 30, 2013		December 31, 2012
Common stock (other current assets)	$	1,359	$	1,940
Convertible preferred stock (other noncurrent assets)		800		800
	$	2,159	$	2,740

During the quarter ended September 30, 2013, the Company classified the common stock as held for sale and recorded other-than-temporary impairment of $0.6 million.