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Cash and Investments in Marketable Securities

12 Months Ended

Dec. 31, 2018

Cash and Investments in Marketable Securities

Note 2 — Cash and Investments in Marketable Securities

Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):

	Estimated Fair Value at
	December 31, 2018		December 31, 2017
Cash and cash equivalents	$	194,905	$	4,762
Short-term investments		1,140,445		291,370
Long-term investments		582,889		57,088
Total cash and investments in marketable securities	$	1,918,239	$	353,220

We invest in liquid, high quality debt securities. Our investments in debt securities are subject to interest rate risk. To minimize the exposure due to an adverse shift in interest rates, we invest in securities with maturities of two years or less and maintain a weighted average maturity of one year or less. All of our long-term investments as of December 31, 2018 and 2017 had maturities between one and two years.

Gross unrealized gains and losses were not significant at either December 31, 2018 or 2017. During the years ended December 31, 2018, 2017 and 2016, we sold available-for-sale securities totaling $12.0 million, $37.5 million, and $5.0 million, respectively, and realized gains and losses were not significant in any of those periods.

Under the terms of our 7.75% senior secured notes due October 2020, we are required to maintain a minimum cash and investments in marketable securities balance of $60.0 million.

Our portfolio of cash and investments in marketable securities includes (in thousands):

			Estimated Fair Value at
	Fair Value Hierarchy Level		December 31, 2018		December 31, 2017
Corporate notes and bonds		2	$	1,288,986	$	216,253
Corporate commercial paper		2		498,048		128,096
Obligations of U.S. government agencies		2		12,977		2,977
Available-for-sale investments				1,800,011		347,326
Money market funds		1		105,656		302
Certificate of deposit	N/A			6,760		1,132
Cash	N/A			5,812		4,460
Total cash and investments in marketable securities			$	1,918,239	$	353,220

Level 1 —

Quoted prices in active markets for identical assets or liabilities.

Level 2 —

Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 —

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

During the years ended December 31, 2018 and 2017, there were no transfers between Level 1 and Level 2 of the fair value hierarchy.

At December 31, 2018 and 2017, we had letter of credit arrangements in favor of our landlords and certain vendors totaling $6.6 million and $1.1 million, respectively. These letters of credit are secured by investments of similar amounts.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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