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Fair Value Of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Fair Value, Assets And Liabilities Measured On Recurring Basis | The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2016 and December 31, 2015:
|  |  | Fair Value Measurement Using
| Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3
| (In thousands)
As of December 31, 2016: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments in money market funds | $ | 134,790 |  |  | $ | 134,790 |  |  | $ | — |  |  | $ | — |
Debt securities issued by the U.S. Treasury | 1,626,764 |  |  | 1,626,764 |  |  | — |  |  | — |
Equity securities of public companies | 2,174 |  |  | 2,174 |  |  | — |  |  | — |
Foreign currency forward contracts (1) | 242 |  |  | — |  |  | 242 |  |  | — |
Total | $ | 1,763,970 |  |  | $ | 1,763,728 |  |  | $ | 242 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Contingent interest derivative on Subordinated Convertible Debentures | $ | 14,339 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,339 |
Foreign currency forward contracts (2) | 87 |  |  | — |  |  | 87 |  |  | — |
Total | $ | 14,426 |  |  | $ | — |  |  | $ | 87 |  |  | $ | 14,339 |
As of December 31, 2015: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments in money market funds | $ | 137,593 |  |  | $ | 137,593 |  |  | $ | — |  |  | $ | — |
Debt securities issued by the U.S. Treasury | 1,685,882 |  |  | 1,685,882 |  |  | — |  |  | — |
Equity securities of public companies | 890 |  |  | 890 |  |  | — |  |  | — |
Foreign currency forward contracts (1) | 230 |  |  | — |  |  | 230 |  |  | — |
Total | $ | 1,824,595 |  |  | $ | 1,824,365 |  |  | $ | 230 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Contingent interest derivative on Subordinated Convertible Debentures | $ | 30,126 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,126 |
Foreign currency forward contracts (2) | 164 |  |  | — |  |  | 164 |  |  | — |
Total | $ | 30,290 |  |  | $ | — |  |  | $ | 164 |  |  | $ | 30,126 |
(1) | Included in Other current assets
(2) | Included in Accounts payable and accrued liabilities
Changes In Fair Value Measurement Of Level 3 Items | The following table summarizes the change in the fair value of the Company’s contingent interest derivative on Subordinated Convertible Debentures during the year ended December 31, 2016 and 2015:
| Year Ended December 31,
| 2016 |  | 2015
| (In thousands)
Beginning balance | $ | 30,126 |  |  | $ | 26,755 |
Unrealized (gain) loss on contingent interest derivative on Convertible Debentures | (2,402 | ) |  | 14,130 |
Payment of contingent interest | (13,385 | ) |  | (10,759 | )
Ending balance | $ | 14,339 |  |  | $ | 30,126 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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