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FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Marketable Securities | At September 30, 2019 and December 31, 2018, the fair value of marketable securities are as follows:
| September 30, 2019 |  | December 31, 2018
| (In thousands)
Marketable equity securities | $ | 157,174 |  |  | $ | 419 |
Available-for-sale marketable debt securities | — |  |  | 123,246 |
Total marketable securities | $ | 157,174 |  |  | $ | 123,665 |
Schedule of Current Available-for-sale Marketable Securities | At December 31, 2018, current available-for-sale marketable debt securities were as follows:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (In thousands)
Treasury discount notes | $ | 112,291 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 112,291 |
Commercial paper | 10,955 |  |  | — |  |  | — |  |  | 10,955 |
Total available-for-sale marketable debt securities | $ | 123,246 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 123,246 |
Schedule of Proceeds from Maturities and Sales of Available-for-sale Marketable Debt Securities | The following table presents the proceeds from maturities of available-for-sale marketable debt securities:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
Proceeds from maturities of available-for-sale marketable debt securities | $ | — |  |  | $ | 115,000 |  |  | $ | 163,500 |  |  | $ | 125,000 |
Schedule of Realized and Unrealized Gains and Losses | The following table presents a summary of realized and unrealized gains and losses recorded in other income (expense), net, as adjustments to the carrying value of equity securities without readily determinable fair values held as of September 30, 2019 and 2018.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
Upward adjustments (gross unrealized gains) | $ | 53 |  |  | $ | — |  |  | $ | 53 |  |  | $ | 128,786 |
Downward adjustments including impairment (gross unrealized losses) | (543 | ) |  | — |  |  | (1,193 | ) |  | (2,588 | )
Total | $ | (490 | ) |  | $ | — |  |  | $ | (1,140 | ) |  | $ | 126,198 |
Realized and unrealized gains and losses for the Company's marketable equity securities and investments without readily determinable fair values for the three and nine months ended September 30, 2019 and 2018 are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
Realized (losses) gains, net, for equity securities sold | $ | (8 | ) |  | $ | 702 |  |  | $ | 2,136 |  |  | $ | 27,874 |
Unrealized (losses) gains, net, on equity securities held | (5,066 | ) |  | (115 | ) |  | 24,181 |  |  | 126,444 |
Total (losses) gains recognized, net, in other income, net | $ | (5,074 | ) |  | $ | 587 |  |  | $ | 26,317 |  |  | $ | 154,318 |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:
| September 30, 2019
| Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value Measurements
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 818,158 |  |  | $ | — |  |  | $ | — |  |  | $ | 818,158 |
Treasury discount notes | — |  |  | 1,349,257 |  |  | — |  |  | 1,349,257 |
Time deposits | — |  |  | 145,035 |  |  | — |  |  | 145,035 |
Marketable securities: |  |  |  |  |  |  |
Marketable equity security | 157,174 |  |  | — |  |  | — |  |  | 157,174 |
Other non-current assets: |  |  |  |  |  |  |
Warrant | — |  |  | — |  |  | 8,929 |  |  | 8,929 |
Total | $ | 975,332 |  |  | $ | 1,494,292 |  |  | $ | 8,929 |  |  | $ | 2,478,553 |
Liabilities: |  |  |  |  |  |  |
Contingent consideration arrangement | $ | — |  |  | $ | — |  |  | $ | (13,664 | ) |  | $ | (13,664 | )
| December 31, 2018
| Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value Measurements
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 880,815 |  |  | $ | — |  |  | $ | — |  |  | $ | 880,815 |
Treasury discount notes | — |  |  | 561,733 |  |  | — |  |  | 561,733 |
Commercial paper | — |  |  | 162,417 |  |  | — |  |  | 162,417 |
Time deposits | — |  |  | 90,036 |  |  | — |  |  | 90,036 |
Marketable securities: |  |  |  |  |  |  |
Treasury discount notes | — |  |  | 112,291 |  |  | — |  |  | 112,291 |
Commercial paper | — |  |  | 10,955 |  |  | — |  |  | 10,955 |
Marketable equity security | 419 |  |  | — |  |  | — |  |  | 419 |
Total | $ | 881,234 |  |  | $ | 937,432 |  |  | $ | — |  |  | $ | 1,818,666 |
Liabilities: |  |  |  |  |  |  |
Contingent consideration arrangements | $ | — |  |  | $ | — |  |  | $ | (28,631 | ) |  | $ | (28,631 | )
Schedule of Changes in Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) | The following tables present the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
| Three Months Ended September 30,
| 2019 |  | 2018
| Warrant |  | Contingent Consideration Arrangements |  | Contingent Consideration Arrangements
| (In thousands)
Balance at July 1 | $ | — |  |  | $ | (29,803 | ) |  | $ | (1,910 | )
Total net (losses) gains: |  |  |  |  |
Included in earnings: |  |  |  |  |
Fair value adjustments | (8,689 | ) |  | 16,139 |  |  | (55 | )
Included in other comprehensive loss | — |  |  | — |  |  | (15 | )
Fair value date of acquisition | 17,618 |  |  | — |  |  | — |
Balance at September 30 | $ | 8,929 |  |  | $ | (13,664 | ) |  | $ | (1,980 | )
| Nine Months Ended September 30,
| 2019 |  | 2018
| Warrant |  | Contingent Consideration Arrangements |  | Contingent Consideration Arrangements
| (In thousands)
Balance at January 1 | $ | — |  |  | $ | (28,631 | ) |  | $ | (2,647 | )
Total net (losses) gains: |  |  |  |  |
Included in earnings: |  |  |  |  |
Fair value adjustments | (8,689 | ) |  | 12,993 |  |  | (265 | )
Included in other comprehensive loss | — |  |  | (14 | ) |  | (16 | )
Fair value at date of acquisition | 17,618 |  |  | — |  |  | — |
Settlements | — |  |  | 1,988 |  |  | 948 |
Balance at September 30 | $ | 8,929 |  |  | $ | (13,664 | ) |  | $ | (1,980 | )
Schedule of Carrying Value and the Fair Value of Financial Instruments Measured at Fair Value Only for Disclosure Purposes | The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:
| September 30, 2019 |  | December 31, 2018
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| (In thousands)
Current portion of long-term debt | $ | (13,750 | ) |  | $ | (13,681 | ) |  | $ | (13,750 | ) |  | $ | (12,753 | )
Long-term debt, net(a) | (3,111,882 | ) |  | (3,934,574 | ) |  | (2,245,548 | ) |  | (2,460,204 | )
_____________________ (a) At September 30, 2019 and December 31, 2018, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $417.8 million and $88.9 million, respectively.

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