CASH AND CASH EQUIVALENTS AND INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2012

Summary Of Cash And Cash Equivalents And Investments By Balance Sheet Classification

The following table summarizes our cash and cash equivalents and investments by balance sheet classification at the dates indicated (in thousands):

	June 30, 2012				December 31, 2011
	Amortized Cost		Fair Value (1)		Amortized Cost		Fair Value (1)
Cash and cash equivalents	$	197,356	$	197,356	$	192,165	$	192,165
Short-term investments		41,339		41,360		36,688		36,774
Long-term investments		10,790		10,896		24,964		24,832
Total cash and cash equivalents and investments	$	249,485	$	249,612	$	253,817	$	253,771

(1) See Note 16 – Fair Value Measurements for details regarding fair value measurements.

Summary Of Investments By Investment Category

The following table summarizes our investments by investment category at the dates indicated (in thousands):

	June 30, 2012
Investment category:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale securities:
US treasury securities	$	10,998	$	1	$	—		$	10,999
US agency securities		3,508		9		—			3,517
Corporate notes/bonds		36,566		157		(40	)		36,683
Certificates/term deposits		1,057		—		—			1,057
Total investments	$	52,129	$	167	$	(40	)	$	52,256

	December 31, 2011
Investment category:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale securities:
US treasury securities	$	6,920	$	1	$	—		$	6,921
US agency securities		5,526		25		—			5,551
Corporate notes/bonds		47,600		124		(196	)		47,528
Certificates/term deposits		1,606		—		—			1,606
Total investments	$	61,652	$	150	$	(196	)	$	61,606