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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Operating activities: |  |
Net income | $ 6,501 | $ 25,510
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,870 | 8,540
Bad debt expense | 948 | 1,835
Deferred taxes | (5,758) | (3,654)
Share-based compensation expense | 8,121 | 6,889
Changes in operating assets and liabilities: |  |
Accounts receivable | 5,044 | 16,033
Prepaid expenses and other current assets | 453 | (992)
Deposits and other assets | (344) | (275)
Accounts payable and accrued expenses | (7,775) | (15,472)
Accrued compensation and employee benefits | (3,015) | (10,712)
Deferred revenue and advance payments | 10,502 | 11,058
Other long-term liabilities | 4,780 | (1,647)
Net cash provided by operating activities | 23,327 | 37,113
Investing activities: |  |
Proceeds from redemption of short-term investments | 245,680 | 151,860
Purchases of property and equipment | (2,644) | (1,467)
Purchases of short-term investments | (596,376) | (216,602)
Net cash used in investing activities | (353,340) | (66,209)
Financing activities: |  |
Proceeds from sale of class A common stock under exercise of employee stock options | 2,471 | 1,677
Payments on capital lease obligations and other financing arrangements | (9) | (12)
Net cash provided by financing activities | 2,462 | 1,665
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (2,240) | 5,246
Net decrease in cash, cash equivalents, and restricted cash | (329,791) | (22,185)
Cash, cash equivalents and restricted cash, beginning of period | 421,182 | 402,712
Cash, cash equivalents and restricted cash, end of period | $ 91,391 | $ 380,527

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