FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2014

FAIR VALUE MEASUREMENTS

Schedule of assets measured at fair value on a recurring basis

	March 31, 2014
	Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
$s in thousands	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Fixed-income securities (1)	$	399	$	3,611	$	—	$	4,010
Money market funds (2)	$	101	$	—	$	—	$	101
Total	$	500	$	3,611	$	—	$	4,111

	December 31, 2013
	Quoted Prices in Active Markets		Other Observable Inputs		Unobservable Inputs
$s in thousands	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Fixed-income securities (1)	$	399	$	3,607	$	—	$	4,006
Money market funds (2)	$	91	$	—	$	—	$	91
Total	$	490	$	3,607	$	—	$	4,097

(1) We invest a portion of our Restricted cash and investments in fixed-income securities, including U.S. Treasury and U.S. agency securities. We measure the fair value of U.S. Treasury securities using quoted prices for identical assets in active markets. We measure the fair value of U.S. agency securities using observable market activity for similar assets. The fair value of our fixed-income securities approximates our cost basis in the investments.

(2) We invest a portion of our Restricted cash and investments in money market funds. We measure the fair value of these money market fund investments using quoted prices for identical assets in active markets.