MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2012

Marketable Securities [Abstract]

Schedule of available-for-sale marketable securities

At December 31, 2012, 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	$	13,608	$	19	$	—	$	13,627
Total debt securities	13,608		19		—		13,627
Equity security	—		6,977		—		6,977
Total marketable securities	$	13,608	$	6,996	$	—	$	20,604

At December 31, 2011, 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	$	48,621	$	99	$	(15	)	$	48,705
States of the U.S. and state political subdivisions	111,758		587		(22		)	112,323
Total debt securities	160,379		686		(37		)	161,028
Equity security	4,656		11		—			4,667
Total marketable securities	$	165,035	$	697	$	(37	)	$	165,695

Schedule of contractual maturities of debt securities classified as available-for-sale

The contractual maturities of debt securities classified as available-for-sale at December 31, 2012 are as follows:

	Amortized Cost		Estimated Fair Value
	(In thousands)
Due in one year or less	$	12,606	$	12,607
Due after one year through two years	1,002		1,020
Total	$	13,608	$	13,627

Summary of investments with continuous unrealized loss position

The following table summarizes investments in marketable debt securities at December 31, 2011 that have been in a continuous unrealized loss position for less than twelve months:

	Fair Value		Gross Unrealized Losses
	(In thousands)
Corporate debt securities	$	12,920	$	(15	)
States of the U.S. and state political subdivisions	11,711		(22		)
Total	$	24,631	$	(37	)

Schedule of proceeds from maturities and sales of available-for-sale marketable securities and the related gross realized gains and losses

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,
	2012			2011			2010
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable securities	$	205,944		$	600,149		$	768,650
Gross realized gains	4,075			2,482			4,802
Gross realized losses	(5		)	(41		)	(19		)