INVESTMENTS (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2012

Investments Debt And Equity Securities [Abstract]

Investments

The following table summarizes the Company’s available-for-sale securities on hand as of June 30, 2013 and December 31, 2012 (in thousands):

	Investments in marketable securities
	Adjusted Cost		Gross Unrealized Losses			Gross Unrealized Gains		Estimated Fair Value
Marketable securities at June 30, 2013	$	17,608	$	(1,799	)	$	199	$	16,008
Marketable securities at December 31, 2012	$	34,786	$	(10,443	)	$	2,722	$	27,065

The following table summarizes the Company’s available-for-sale securities on hand as of December 31, 2012 and December 31, 2011 (in thousands):

	Investments in marketable securities
	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Estimated Fair Value
Marketable securities at December 31, 2012	$	34,786	$	(10,443	)	$	2,722	$	27,065
Marketable securities at December 31, 2011	$	24,819	$	(4,975	)	$	—	$	19,844

The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2012 (in thousands):

	Less than twelve months					Twelve months or more				Total
	Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value
Marketable equity securities	$	(2,716	)	$	7,728	$	(7,727)	$	4,948	$	(10,443	)	$	12,676