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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 18,320 | $ 5,514
Adjustments to reconcile net income to net cash flows from operating activities: |  |
Depreciation | 15,838 | 18,012
Amortization | 84,528 | 86,992
Amortization of operating lease right-of-use assets | 7,752 | 14,145
Amortization of deferred debt issuance costs | 3,525 | 3,613
Deferred income taxes | (11,742) | (10,540)
Stock-based compensation expense | 20,790 | 22,943
Other | (27) | 4,339
Changes in operating assets and liabilities: |  |
Receivables | 55,953 | 41,261
Accounts payable | (5,080) | 1,680
Accrued employee compensation | (1,140) | 13,585
Deferred revenue | 10,339 | 14,361
Other current and noncurrent assets and liabilities | (51,158) | (23,847)
Net cash flows from operating activities | 147,898 | 192,058
Cash flows from investing activities: |  |
Purchases of property and equipment | (12,968) | (14,091)
Purchases of software and distribution rights | (20,041) | (21,556)
Net cash flows from investing activities | (33,009) | (35,647)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 2,526 | 2,853
Proceeds from exercises of stock options | 7,252 | 6,518
Repurchase of stock-based compensation awards for tax withholdings | (14,833) | (11,150)
Repurchases of common stock | (39,411) | (28,881)
Proceeds from revolving credit facility | 0 | 30,000
Repayment of revolving credit facility | (55,000) | (109,000)
Repayment of term portion of credit agreement | (29,212) | (29,212)
Payments on or proceeds from other debt, net | (10,187) | (10,044)
Net cash flows from financing activities | (138,865) | (148,916)
Effect of exchange rate fluctuations on cash | 84 | 4,952
Net increase (decrease) in cash and cash equivalents | (23,892) | 12,447
Cash and cash equivalents, beginning of period | 165,374 | 121,398
Cash and cash equivalents, end of period | 141,482 | 133,845
Supplemental cash flow information |  |
Income taxes paid | 28,131 | 19,733
Interest paid | $ 35,966 | $ 46,489

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