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Cash and Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Cash and Investments in Marketable Securities | Note 2 — Cash and Investments in Marketable Securities Cash and investments in marketable securities, including cash equivalents and restricted cash, are as follows (in thousands).
|  | Estimated Fair Value at |
|  | December 31, 2016 |  |  | December 31, 2015 |
Cash and cash equivalents |  | $ | 59,640 |  |  | $ | 55,570 |
Short-term investments |  |  | 329,462 |  |  |  | 253,374 |
Total cash and investments in marketable securities |  | $ | 389,102 |  |  | $ | 308,944 |
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. As December 31, 2016 and 2015, all of our investments had maturities of one year or less. Gross unrealized gains and losses were not significant at either December 31, 2016 or 2015. During the years ended December 31, 2016, 2015 and 2014, we sold available-for-sale securities totaling $5.0 million, $42.5 million, and $21.7 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, 2016 |  |  | December 31, 2015 |
Corporate commercial paper |  |  | 2 |  |  | $ | 160,920 |  |  | $ | 61,150 |
Corporate notes and bonds |  |  | 2 |  |  |  | 156,044 |  |  |  | 181,969 |
Obligations of U.S. government agencies |  |  | 2 |  |  |  | 13,749 |  |  |  | 7,325 |
Available-for-sale investments |  |  |  |  |  |  | 330,713 |  |  |  | 250,444 |
Money market funds |  |  | 1 |  |  |  | 51,104 |  |  |  | 53,728 |
Certificate of deposit |  | N/A |  |  |  | 2,930 |  |  |  | 2,930 |
Cash |  | N/A |  |  |  | 4,355 |  |  |  | 1,842 |
Total cash and investments in marketable securities |  |  |  |  |  | $ | 389,102 |  |  | $ | 308,944 |
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 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.
All of our investments are categorized as Level 1 or Level 2, as explained in the table above. During the years ended December 31, 2016, 2015 and 2014 there were no transfers between Level 1 and Level 2 of the fair value hierarchy. At December 31, 2016 and 2015, we had letter of credit arrangements in favor of a landlord and certain vendors totaling $2.4 million. These letters of credit are secured by investments of similar amounts.

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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