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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 | $ 34,355 | $ 22,501 | $ 18,195
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 16,699 | 3,701 | 15,532
Sales allowances and bad debt | 124 | 1,912 | 2,269
Net realized loss on short-term investments | 41 | 153 | 0
Deferred taxes | (2,614) | (8,274) | (3,605)
Release of liabilities for unrecognized tax benefits | (2,837) | 0 | 0
Share-based compensation expense | 10,209 | 14,636 | 14,267
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (3,672) | (8,357) | 15,348
Prepaid expenses and other current assets | 6,415 | (6,561) | (4,739)
Deposits and other assets | 761 | (1,201) | 3,029
Accounts payable and accrued expenses | (7,321) | 3,378 | (9,093)
Accrued compensation and employee benefits | (2,658) | 5,116 | (6,209)
Deferred revenue and advance payments | 20,836 | (22,126) | (589)
Operating lease liabilities | (8,620) | 0 | 0
Other long-term liabilities | (851) | 5,749 | 33,917
Net cash provided by operating activities | 60,867 | 10,627 | 78,322
Investing activities: |  |  |
Proceeds from redemption of short-term investments | 684,356 | 491,800 | 390,720
Purchases of property and equipment | (10,182) | (6,846) | (3,982)
Purchases of short-term investments | (320,487) | (694,018) | (456,468)
Net cash provided by (used in) investing activities | 353,687 | (209,064) | (69,730)
Financing activities: |  |  |
Proceeds from sale of class A common stock under exercise of employee stock options | 6,569 | 2,471 | 1,677
Purchases of treasury stock | (72,719) | (110,977) | 0
Payments on capital lease obligations and other financing arrangements prior to the adoption of ASU 2016-02 | 0 | (9) | (21)
Net cash (used in) provided by financing activities | (66,150) | (108,515) | 1,656
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (1,374) | (3,444) | 8,222
Net increase (decrease) in cash, cash equivalents, and restricted cash | 347,030 | (310,396) | 18,470
Cash, cash equivalents, and restricted cash, beginning of year | 110,786 | 421,182 | 402,712
Cash, cash equivalents, and restricted cash, end of year | 457,816 | 110,786 | 421,182
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for income taxes, net of tax refunds | $ 5,911 | $ 13,214 | $ 29,279

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