
	September 30, 2018
	Quoted Prices in		Other Observable		Unobservable
	Active Markets		Inputs		Inputs
$s in thousands	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Fixed-income securities (1)	$	1,552	$	2,582	$	—	$	4,134
Money market funds (2)		763		—		—		763
Interest rate swap agreement (3)		—		2,722		—		2,722
Total	$	2,315	$	5,304	$	—	$	7,619


	December 31, 2017
	Quoted Prices in		Other Observable		Unobservable
	Active Markets		Inputs		Inputs
$s in thousands	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Fixed-income securities (1)	$	1,396	$	2,649	$	—	$	4,045
Money market funds (2)		1,757		—		—		1,757
Total	$	3,153	$	2,649	$	—	$	5,802

Liabilities:
Interest rate swap agreement (3)	$	—	$	638	$	—	$	638
Total	$	—	$	638	$	—	$	638

(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. Money market funds are considered restricted cash for purposes of reconciling the beginning-of-period and end-of-period amounts presented in the Company’s consolidated statements of cash flows.

(3)

In order to manage interest rate exposure, we entered into an interest rate swap agreement in October 2014 that effectively converts a portion of our variable-rate debt to a fixed interest rate. The swap is designated as a cash flow hedge, with gains and losses deferred in other comprehensive income to be recognized as an adjustment to interest expense in the same period that the hedged interest payments affect earnings. The interest rate swap has an effective date of December 31, 2014 with an initial notional amount of $250.0 million. The fair value of the interest rate swap agreement represents the difference in the present value of cash flows calculated at the contracted interest rates and at current market interest rates at the end of the period. We calculate the fair value of the interest rate swap agreement quarterly based on the quoted market price for the same or similar financial instruments. The fair value of the interest rate swap agreement is included in Other assets and Other long-term liabilities in the Company’s consolidated balance sheet as of September 30, 2018 and December 31, 2017, respectively.