MARKETABLE SECURITIES (Tables)

The contractual maturities of debt securities classified as current available-for-sale at December 31, 2014 are as follows:



	Amortized Cost		Fair Value
	(In thousands)
Due in one year or less	$	54,502	$	54,455
Due after one year through five years	104,916		104,742
Total	$	159,418	$	159,197

At December 31, 2014, current available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
Corporate debt securities	$	159,418	$	34	$	(255	)	$	159,197
Total debt securities	159,418		34		(255		)	159,197
Equity security	98		1,353		—			1,451
Total marketable securities	$	159,516	$	1,387	$	(255	)	$	160,648

The unrealized loss of $0.3 million in the table above relates to fifty-eight securities with an aggregate fair value of $123.2 million. There are no investments in current available-for-sale marketable debt securities that have been in a continuous unrealized loss position for longer than twelve months as of December 31, 2014.

All of the Company’s marketable debt securities are rated investment grade. The gross unrealized losses on the marketable debt securities relate principally to changes in interest rates. Because the Company does not intend to sell any marketable debt securities and it is not more likely than not that the Company will be required to sell any marketable debt securities before recovery of their amortized cost bases, which may be maturity, the Company does not consider any of its marketable debt securities to be other-than-temporarily impaired at December 31, 2014.

At December 31, 2013, current available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Corporate debt security	$	1,004	$	4	$	—	$	1,008
Total debt security	1,004		4		—		1,008
Equity securities	216		4,780		—		4,996
Total marketable securities	$	1,220	$	4,784	$	—	$	6,004

The following table presents the proceeds from maturities and sales of current and non-current available-for-sale marketable securities and the related gross realized gains and losses:



	December 31,
	2014		2013		2012
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable securities	$	25,223	$	82,160	$	205,944
Gross realized gains	3,362		35,692		4,075
Gross realized losses	—		—		(5		)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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