FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The assets and liabilities measured at fair value on a recurring basis are as follows (in thousands):

	As of June 30, 2012
	Fair Value Measurements Using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market funds	$	26,262	$	—	$	—	$	26,262
Investments	—		5,711		—		5,711

	As of December 31, 2011
	Fair Value Measurements Using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market funds	$	25,383	$	—	$	—	$	25,383
Investments	—		4,983		—		4,983
Contingent consideration to be paid in cash for the acquisitions	—		—		1,557		1,557

Reconciliations of liabilities measured and carried at fair value on a recurring basis

Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012			2011
Contingent consideration for acquisitions
Balance at beginning of period	$	—	$	11,795	$	1,557		$	11,370
Cash payments	—		—		(1,557		)	(230		)
Change in estimates included in earnings	—		1,327		—			1,982
Balance at end of period	$	—	$	13,122	$	—		$	13,122