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Financial Instruments | 12 Months Ended
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Dec. 31, 2018
Cash, Cash Equivalents And Marketable Securities [Abstract] |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | Financial Instruments Cash, Cash Equivalents, and Marketable Securities The following table summarizes the Company’s cash, cash equivalents, and marketable securities and the fair value categorization of the financial instruments measured at fair value on a recurring basis:
| As of December 31,
| 2018 |  | 2017
| (In thousands)
Cash | $ | 37,190 |  |  | $ | 135,092 |
Time deposits | 3,810 |  |  | 3,682 |
Money market funds (Level 1) | 120,832 |  |  | 116,068 |
Debt securities issued by the U.S. Treasury (Level 1) | 1,117,175 |  |  | 2,169,197 |
Total | $ | 1,279,007 |  |  | $ | 2,424,039 |
Cash and cash equivalents | $ | 357,415 |  |  | $ | 465,851 |
Restricted cash (included in Other long-term assets) | 9,338 |  |  | 9,288 |
Total Cash, cash equivalents, and restricted cash | 366,753 |  |  | 475,139 |
Marketable securities | 912,254 |  |  | 1,948,900 |
Total | $ | 1,279,007 |  |  | $ | 2,424,039 |
The fair value of the debt securities held as of December 31, 2018 was $1.12 billion, including less than $0.1 million of gross and net unrealized losses. All of the debt securities held as of December 31, 2018 have contractual maturities of less than one year. The lower Cash and cash equivalents and Marketable securities balances at December 31, 2018 reflect the cash used to settle the principal amount of the Subordinated Convertible Debentures on May 1, 2018, as discussed in Note 4 “Debt and Interest Expense.” Fair Value Measurements The fair value of the Company’s investments in money market funds approximates their face value. Such instruments are classified as Level 1 and are included in Cash and cash equivalents. The fair value of the debt securities consisting of U.S. Treasury bills is based on their quoted market prices and are classified as Level 1. Debt securities purchased with original maturities in excess of three months are included in Marketable securities. Debt securities purchased with original maturities less than three months are included in Cash and cash equivalents. As of December 31, 2018, the Company’s other financial instruments include cash, accounts receivable, restricted cash, and accounts payable whose carrying values approximated their fair values. The fair values of the Company’s senior notes due 2023 (the “2023 Senior Notes”), the senior notes due 2025 (the “2025 Senior Notes”), and the senior notes due 2027 (the “2027 Senior Notes”) were $741.3 million, $502.2 million, and $524.2 million, respectively, as of December 31, 2018. The fair values of these debt instruments are based on available market information from public data sources and are classified as Level 2. As part of the settlement of the Subordinated Convertible Debentures in the second quarter of 2018, the Company estimated the fair value of the liability component of the debentures, based on the present value of the remaining contractual cash flows, using a discount rate of 8.42% (the estimated borrowing rate for similar non-convertible debt). The fair value of the liability component at the time of extinguishment was $651.3 million and was classified as Level 3. In connection with the sale of the customer contracts of the Security Services business, the Company estimated the fair value of the total consideration expected to be received based on the estimated probability and timing of customers consenting to assignment of their contracts to Neustar. This fair value measurement was classified as Level 3.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Cash, Cash Equivalents, And Marketable Securities [Abstract] + References No definition available. + Details
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