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Cash and Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2013
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, 2013 |  |  | December 31, 2012 |
Cash and cash equivalents |  | $ | 39,067 |  |  | $ | 25,437 |
Short-term investments |  |  | 197,959 |  |  |  | 251,757 |
Restricted cash |  |  | 25,000 |  |  |  | 25,000 |
Total cash and investments in marketable securities |  | $ | 262,026 |  |  | $ | 302,194 |
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 of December 31, 2013 and 2012, all of our investments had contractual maturities of one year or less and were classified as short-term. Gross unrealized gains and losses were not significant at either December 31, 2013 or 2012. During the years ended December 31, 2013, 2012 and 2011, we sold available-for-sale securities totaling $2.9 million, $5.4 million and $210.1 million respectively, and realized gains and losses were not significant in any of those periods. Restricted cash of $25.0 million is required to be maintained in a separate account until July 1, 2015 under the terms of our 12% Senior Secured Notes due July 2017 (see Note 5). Our portfolio of cash and investments in marketable securities includes (in thousands):
|  | Fair Value Hierarchy Level |  |  | Estimated Fair Value at |
|  |  | December 31, 2013 |  |  | December 31, 2012 |
Corporate notes and bonds |  |  | 2 |  |  | $ | 138,515 |  |  | $ | 241,158 |
U.S. corporate commercial paper |  |  | 2 |  |  |  | 59,444 |  |  |  | 3,990 |
Obligations of U.S. government agencies |  |  | 2 |  |  |  | — |  |  |  | 6,108 |
Obligations of U.S. states and municipalities |  |  | 2 |  |  |  | — |  |  |  | 1,504 |
Available-for-sale investments |  |  |  |  |  |  | 197,959 |  |  |  | 252,760 |
Money market funds |  |  | 1 |  |  |  | 26,453 |  |  |  | 22,487 |
Cash, including restricted cash |  |  | N/A |  |  |  | 37,614 |  |  |  | 26,947 |
Total cash and investments in marketable securities |  |  |  |  |  | $ | 262,026 |  |  | $ | 302,194 |
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. We use a market approach to value our Level 2 investments. During the years ended December 31, 2013 and 2012, there were no transfers between Level 1 and Level 2 of the fair value hierarchy. At December 31, 2013 and 2012, 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 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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=28364263&loc=d3e13433-108611 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 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 5: 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 6: 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=28364263&loc=d3e13504-108611 + Details
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