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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 127,791 | $ 72,660 | $ 67,062
Adjustments to reconcile net income to net cash flows from operating activities: |  |  |
Depreciation | 20,900 | 24,728 | 24,092
Amortization | 112,493 | 115,588 | 98,477
Amortization of operating lease right-of-use assets | 10,515 | 23,448 | 15,934
Amortization of deferred debt issuance costs | 4,685 | 4,802 | 4,128
Deferred income taxes | 3,733 | 3,349 | (22,140)
Stock-based compensation expense | 27,242 | 29,602 | 36,763
Other | 855 | 6,017 | 5,175
Changes in operating assets and liabilities, net of impact of acquisitions: |  |  |
Receivables | (43,830) | 8,793 | (19,054)
Accounts payable | 1,408 | 2,484 | (7,703)
Accrued employee compensation | 3,674 | 18,491 | (10,829)
Deferred revenue | (17,332) | 9,421 | (37,561)
Other current and noncurrent assets and liabilities | (31,661) | (4,488) | (21,739)
Net cash flows from operating activities | 220,473 | 314,895 | 132,605
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (20,582) | (17,804) | (23,099)
Purchases of software and distribution rights | (24,786) | (28,829) | (24,915)
Acquisition of businesses, net of cash acquired | 0 | 0 | (757,268)
Other | 0 | 15,934 | (25,199)
Net cash flows from investing activities | (45,368) | (30,699) | (830,481)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock | 3,440 | 3,759 | 3,591
Proceeds from exercises of stock options | 8,862 | 11,924 | 12,985
Repurchase of stock-based compensation awards for tax withholdings | (14,833) | (11,568) | (3,986)
Repurchase of common stock | (107,378) | (28,881) | (35,617)
Proceeds from revolving credit facility | 35,000 | 30,000 | 280,000
Repayments of revolving credit facility | (90,000) | (214,000) | (41,000)
Proceeds from term portion of credit agreement | 0 | 0 | 500,000
Repayments of term portion of credit agreement | (38,950) | (38,950) | (28,900)
Payment for debt issuance costs | 0 | 0 | (12,830)
Payments on or proceeds from other debt, net | (15,185) | (13,854) | (7,020)
Net (decrease) increase in settlement assets and liabilities | (37,834) | 101,681 | 1,127
Net cash flows from financing activities | (256,878) | (159,889) | 668,350
Effect of exchange rate fluctuations on cash | 533 | (57) | (1,495)
Net (decrease) increase in cash and cash equivalents | (81,240) | 124,250 | (31,021)
Cash and cash equivalents, including settlement deposits, beginning of period | 265,382 | 141,132 | 172,153
Cash and cash equivalents, including settlement deposits, end of period | 184,142 | 265,382 | 141,132
Cash and cash equivalents | 122,059 | 165,374 | 121,398
Settlement assets | 62,083 | 100,008 | 19,734
Total cash and cash equivalents, including settlement deposits | 184,142 | 265,382 | 141,132
Supplemental cash flow information |  |  |
Income taxes paid, net | 46,166 | 27,760 | 27,727
Interest paid | $ 40,071 | $ 51,991 | $ 58,980

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