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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2019 | Jul. 31, 2018
Cash flows from operating activities: |  |
Net income (loss) | $ 43,650 | $ (38,592)
Adjustments to reconcile net income (loss) to net cash used by operating activities: |  |
Depreciation and amortization | 12,777 | 11,731
Stock-based compensation expense | 5,462 | 5,714
Tradename write-offs |  | 106,555
Provision for doubtful accounts | 3,549 | 3,707
Gain on cash surrender value of life insurance policies | (2,338) | (1,347)
Gain on marketable securities | (1,945) | (4,001)
Deferred income taxes | 1,974 | (22,564)
Change in other assets and liabilities: |  |
Deferred compensation | 11,652 | 3,021
Receivables due from clients | (31,450) | (16,270)
Income taxes and other receivables | (3,176) | (7,811)
Prepaid expenses and other assets | (9,845) | (4,356)
Unearned compensation | (14,818) | (17,463)
Income taxes payable | (1,911) | 1,434
Accounts payable and accrued liabilities | (175,709) | (135,405)
Other | 209 | (1,845)
Net cash used by operating activities | (161,919) | (117,492)
Cash flows from investing activities: |  |
Purchase of property and equipment | (10,706) | (13,163)
Purchase of marketable securities | (1,600) | (1,396)
Proceeds from sales/maturities of marketable securities | 1,599 | 8,240
Premium on company-owned life insurance policies | (341) | (398)
Proceeds from life insurance policies | 1,673 | 85
Dividends received from unconsolidated subsidiaries | 166 |
Net cash used in investing activities | (9,209) | (6,632)
Cash flows from financing activities: |  |
Repurchases of common stock | (12,738) |
Payments of tax withholdings on restricted stock | (8,591) | (13,054)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 4,313 | 4,105
Payments on life insurance policy loans | (943) |
Principal payments on finance leases | (432) |
Dividends paid to shareholders | (6,081) | (6,027)
Principal payments on term loan |  | (5,156)
Payment of contingent consideration from acquisitions | (455) | (455)
Net cash used in financing activities | (24,927) | (20,587)
Effect of exchange rate changes on cash and cash equivalents | (5,668) | (10,408)
Net decrease in cash and cash equivalents | (201,723) | (155,119)
Cash and cash equivalents at beginning of period | 626,360 | 520,848
Cash and cash equivalents at end of the period | $ 424,637 | $ 365,729

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