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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities |  |  |
Net income | $ 629,302 | $ 143,321 | $ 12,556
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Gain from sale of Promacta license | (812,797) | 0 | 0
Change in estimated fair value of contingent liabilities | (30) | 3,448 | 2,580
Realized gain on sale of short-term investment | (41) | (2,611) | (831)
Depreciation and amortization of intangible assets | 18,361 | 12,784 | 10,955
(Gain) loss on equity investment in Viking | (2,888) | (47,658) | (1,114)
Amortization/accretion of premium (discount) on investments, net | (10,274) | (5,452) | (81)
Amortization of debt discount and issuance fees | 29,988 | 43,954 | 11,619
Amortization of commercial license and other economic rights | 25,370 | 1,934 | 759
Share-based compensation | 24,515 | 20,846 | 24,915
Deferred income taxes, net | 74,829 | 29,739 | 44,518
Royalties recorded in retained earnings upon adoption of ASC 606 | 0 | 32,707 | 0
Other | (1,456) | 2,832 | (870)
Changes in operating assets and liabilities, net of acquisition: |  |  |
Accounts receivable, net | 25,463 | (29,544) | (8,358)
Inventory | (2,061) | (2,559) | (843)
Accounts payable and accrued liabilities | (6,826) | (4,542) | (1,713)
Income taxes receivable | (11,219) | 318 | (460)
Other economic rights | (12,000) | 0 | 0
Other | 2,428 | (5,458) | (5,062)
Net cash provided by (used in) operating activities | (29,336) | 194,059 | 88,570
Investing activities |  |  |
Proceeds from sale of Promacta license | 812,797 | 0 | 0
Purchase of commercial license rights | 0 | (10,000) | 0
Cash paid for acquisition, net of cash acquired | (11,840) | (5,856) | (26,653)
Purchases of property and equipment | (2,553) | (887) | (2,156)
Purchases of short-term investments | (2,356,545) | (1,434,255) | (254,258)
Proceeds from sale of short-term investments | 535,877 | 131,942 | 86,985
Proceeds from maturity of short-term investments | 1,494,851 | 892,873 | 109,649
Proceeds from commercial license rights | 0 | 0 | 7,054
Proceeds received from repayment of Viking note receivable | 0 | 3,914 | 200
Cash paid for equity method investment | (1,000) | 0 | 0
Other, net | (4,669) | (1,000) | 0
Net cash provided by (used in) investing activities | 466,918 | (423,269) | (79,179)
Financing activities |  |  |
Repayment of debt | (27,323) | (217,674) | 0
Gross proceeds from issuance of 2023 Convertible Senior Notes | 0 | 750,000 | 0
Payment of debt issuance costs | 0 | (16,900) | 0
Proceeds from issuance of warrants | 0 | 90,000 | 0
Purchase of convertible bond hedge | 0 | (140,250) | 0
Proceeds from bond hedge settlement | 12,401 | 439,559 | 0
Payments to convert holders for bond conversion | (12,401) | (439,581) | 0
Net proceeds from stock option exercises and ESPP | 2,997 | 20,183 | 4,517
Taxes paid related to net share settlement of equity awards | (4,418) | (3,765) | (10,074)
Share repurchases | (453,048) | (122,868) | (1,966)
Repurchase of warrants | (380) | (30,094) | 0
Payments to CVR Holders | (3,000) | (25) | 0
Net cash provided by (used in) financing activities | (485,172) | 328,585 | (7,523)
Net increase (decrease) in cash and cash equivalents | (47,590) | 99,375 | 1,868
Effect of exchange rate changes on cash | 83 | (215) | 0
Cash, cash equivalents and restricted cash at beginning of year | 119,780 | 20,620 | 18,752
Cash, cash equivalents and restricted cash at end of year | 72,273 | 119,780 | 20,620
Cash paid during the year: |  |  |
Interest paid | 5,827 | 1,513 | 1,838
Taxes paid | 103,817 | 341 | 157
Restricted cash in other current assets | 730 | 2,616 | 0
Supplemental schedule of non-cash investing and financing activities |  |  |
Accrued inventory purchases | 170 | 2,059 | 1,007
Unrealized gain on AFS investments | 256 | 48 | 144
Purchase of fixed assets recorded in accounts payable | $ 495 | $ 15 | $ 0

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- Definition Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). + References No definition available. + Details
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- Definition The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3581-108585 + Details
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