5. FINANCIAL INSTRUMENTS

Cash and Cash Equivalents and Investments

Cash and cash equivalents from our continuing operations consist of the following as of March 31, 2014 and December 31, 2013 (dollars in thousands):


	March 31, 2014		December 31, 2013
Cash	$	175,739	$	155,756
Corporate bonds		1,006		—
Money market funds		87,443		163,005

Cash and cash equivalents, unrestricted		264,188		318,761

Restricted cash		12,948		12,564

Total cash and cash equivalents	$	277,136	$	331,325

Restricted cash balances provide securitization for our outstanding letters of credit.

Investments from our continuing operations consist of the following as of March 31, 2014 and December 31, 2013 (dollars in thousands):


	March 31, 2014
			Gross Unrealized
	Cost		Gain		(Loss)			Fair Value
Short-term investments (available for sale):
Commercial paper	$	15,641	$	—	$	(5	)	$	15,636
Corporate bonds		5,443		—		(7	)		5,436
U.S. Treasury bills		17,253		1		—			17,254

Total short-term investments		38,337		1		(12	)		38,326

Long-term investments (available for sale):
Corporate bonds		8,723		—		(17	)		8,706
Municipal bond		7,850		—		(476	)		7,374

Total long-term investments		16,573		—		(493	)		16,080

Total investments (available for sale)	$	54,910	$	1	$	(505	)	$	54,406


	December 31, 2013
			Gross Unrealized
	Cost		Gain		(Loss)			Fair Value
Short-term investments (available for sale):
U.S. Treasury bills	$	31,591	$	1	$	—		$	31,592
Long-term investments (available for sale):
Municipal bond		7,850		—		(476	)		7,374

Total investments (available for sale)	$	39,441	$	1	$	(476	)	$	38,966

In the table above, unrealized holding gains/(losses) as of March 31, 2014 relate to short-term investments and our long term investment in corporate bonds that have been in a continuous unrealized gain/(loss) position for less than one year. The table also includes unrealized holding losses, greater than one year, that relate to our long-term investment in a municipal bond, which is an auction rate security (“ARS”). When evaluating our investments for possible impairment, we review factors such as the length of time and extent to which fair value has been less than the cost basis, the financial condition of the investee, and our ability and intent to hold the investment for a period of time that may be sufficient for anticipated recovery in fair value. The unrealized loss attributable to our municipal bond at March 31, 2014 is attributable to the continued lack of activity in the ARS market, exposing this investment to liquidity risk.

Our municipal bond is comprised of debt obligations issued by states, cities, counties and other governmental entities, which earn federally tax-exempt interest. Our investment in ARS has a stated term to maturity of greater than one year, and as such, we classify our investment in ARS as non-current on our unaudited consolidated balance sheets within other assets. Auctions can “fail” when the number of sellers of the security exceeds the buyers for that particular auction period. In the event that an auction fails, the interest rate resets at a rate based on a formula determined by the individual security. The ARS for which auctions have failed continues to accrue interest and is auctioned on a set interval until the auction succeeds, the issuer calls the security, or it matures. As of March 31, 2014, we have determined this investment is at risk for impairment due to the nature of the liquidity of the market over the past year. Cumulative unrealized losses as of March 31, 2014 amount to $0.5 million and are reflected within accumulated other comprehensive loss as a component of stockholders’ equity. We believe this impairment is temporary, as we do not intend to sell the investment and it is unlikely we will be required to sell the investment before recovery of its amortized cost basis.

Fair Value Measurements

FASB ASC Topic 820—Fair Value Measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

As of March 31, 2014, we held investments that are required to be measured at fair value on a recurring basis. These investments (available-for-sale) consist of commercial paper, corporate bonds and U.S. treasury bills that are publicly traded and for which market prices are readily available, and our investment in a municipal bond. Available for sale securities included in Level 2 are estimated based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. As of March 31, 2014, we reclassified our investments in U.S. Treasury bills from Level 1 classification to Level 2. The fair value for these investments was not based on identical assets as of March 31, 2014 which resulted in this reclassification. Our investment in a municipal bond is categorized as Level 3 and fair value is estimated utilizing a discounted cash flow analysis as of March 31, 2014 which considers, among other items, the collateralization underlying the security investment, the credit worthiness of the counterparty, the timing of expected future cash flows, and the expectation of the next time the security is expected to have a successful auction. The auction event for our municipal bond investment has failed for multiple years. This security was also compared, when possible, to other observable market data with similar characteristics.

Investments measured at fair value on a recurring basis subject to the disclosure requirements of FASB ASC Topic 820—Fair Value Measurements at March 31, 2014 and December 31, 2013 were as follows (dollars in thousands):


	As of March 31, 2014
	Level 1		Level 2		Level 3		Total
Commercial paper	$	—	$	15,636	$	—	$	15,636
Corporate bonds		—		14,142		—		14,142
U.S. Treasury bills		—		17,254		—		17,254
Municipal bond		—		—		7,374		7,374

Totals	$	—	$	47,032	$	7,374	$	54,406


	As of December 31, 2013
	Level 1		Level 2		Level 3		Total
U.S. Treasury bills	$	31,592	$	—	$	—	$	31,592
Municipal bond		—		—		7,374		7,374

Totals	$	31,592	$	—	$	7,374	$	38,966

The following table presents a rollforward of our assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as defined in FASB ASC Topic 820 for the quarter ended March 31, 2014 (dollars in thousands):


Balance at December 31, 2013	$	7,374
Unrealized gain (loss)		—

Balance at March 31, 2014	$	7,374

Credit Agreement

During the fourth quarter of 2013, we entered into a $70.0 million Amended and Restated Credit Agreement (the “Credit Agreement”) with BMO Harris Bank N.A., in its capacities as the initial lender and letter of credit issuer thereunder and the administrative agent for the lenders which from time to time may be parties to the Credit Agreement. The revolving credit facility under the Credit Agreement is scheduled to mature on June 30, 2016. As of March 31, 2014, there were no outstanding borrowings under the revolving credit facility.