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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities: |  |  |
Net income | $ 22,501 | $ 18,195 | $ 92,239
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 3,701 | 15,532 | 19,944
Bad debt expense | 1,912 | 2,269 | 224
Net realized loss on short-term investments | 153 | 0 | 0
Deferred taxes | (8,274) | (3,605) | (4,450)
Release of liabilities for unrecognized tax benefits | 0 | 0 | (394)
Share-based compensation expense | 14,636 | 14,267 | 11,817
Excess tax benefits from share-based compensation arrangements | 0 | 0 | (1,244)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (8,357) | 15,348 | (16,878)
Prepaid expenses and other current assets | (6,561) | (4,739) | (741)
Deposits and other assets | (1,201) | 3,029 | (4,056)
Accounts payable and accrued expenses | 3,378 | (9,093) | 6,981
Accrued compensation and employee benefits | 5,116 | (6,209) | 579
Accrued restructuring costs | 0 | 0 | (58)
Deferred revenue and advance payments | (22,126) | (589) | 9,691
Other long-term liabilities | 5,749 | 33,917 | (3,065)
Net cash provided by operating activities | 10,627 | 78,322 | 110,589
Investing activities: |  |  |
Proceeds from redemption of short-term investments | 491,800 | 390,720 | 361,680
Purchases of property and equipment | (6,846) | (3,982) | (2,337)
Purchases of short-term investments | (694,018) | (456,468) | (354,999)
Net cash (used in) provided by investing activities | (209,064) | (69,730) | 4,344
Financing activities: |  |  |
Proceeds from sale of class A common stock under exercise of employee stock options | 2,471 | 1,677 | 1,663
Payment of taxes relating to net exercise of employee stock options | 0 | 0 | (3,739)
Excess tax benefits from share-based compensation arrangements | 0 | 0 | 1,244
Purchases of treasury stock | (110,977) | 0 | 0
Payments on capital lease obligations and other financing arrangements | (9) | (21) | (172)
Net cash (used in) provided by financing activities | (108,515) | 1,656 | (1,004)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (3,444) | 8,222 | (4,176)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (310,396) | 18,470 | 109,753
Cash, cash equivalents, and restricted cash, beginning of year | 421,182 | 402,712 | 292,959
Cash, cash equivalents, and restricted cash, end of year | 110,786 | 421,182 | 402,712
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for interest | 0 | 0 | 2
Cash paid during the year for income taxes, net of tax refunds | 13,214 | 29,279 | 24,332
Supplemental disclosure of noncash investing and financing activities: |  |  |
Assets acquired under capital lease obligations and other financing arrangements | $ 0 | $ 0 | $ 0

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