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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net income | $ 77,849 | $ 32,194 | $ 61,338
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 72,990 | 61,067 | 53,559
Loss on disposal of property and equipment | 433 | 267 | 445
Share-based compensation expense | 53,160 | 44,697 | 34,049
Deferred income taxes | (3,272) | (6,546) | (1,339)
Amortization of operating lease right-of-use assets | 11,941 | 10,528 | 10,562
Amortization of debt issuance costs | 3,440 | 1,597 | 2,204
Amortization of discount on convertible senior notes | 18,608 | 4,766 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable and unbilled receivables | (40,973) | 36,842 | (21,540)
Inventories | (25,695) | 12,359 | (8,123)
Prepaid expenses | (5,678) | (2,081) | 2,909
Other current assets | 2,801 | (6,408) | (2,010)
Investment in sales-type leases | 3,346 | (2,882) | (3,699)
Prepaid commissions | (6,876) | (8,057) | (2,719)
Other long-term assets | (3,258) | (7,675) | 4,528
Accounts payable | 29,084 | (6,300) | 7,893
Accrued compensation | 12,312 | 11,595 | 2,495
Accrued liabilities | 34,859 | 4,374 | 3,045
Deferred revenues | 24,179 | 7,620 | 5,445
Operating lease liabilities | (12,503) | (9,543) | (10,040)
Other long-term liabilities | (14,938) | 7,456 | 6,006
Net cash provided by operating activities | 231,809 | 185,870 | 145,008
Investing Activities |  |  |
Software development for external use | (29,368) | (32,024) | (45,770)
Purchases of property and equipment | (28,967) | (22,842) | (15,894)
Business acquisitions, net of cash acquired | (354,163) | (225,000) | 0
Net cash used in investing activities | (412,498) | (279,866) | (61,664)
Financing Activities |  |  |
Proceeds from revolving credit facility | 0 | 150,000 | 0
Repayment of debt and revolving credit facility | 0 | (200,000) | (90,000)
Payments for debt issuance costs for revolving credit facility | 0 | (550) | (2,321)
Proceeds from issuance of convertible senior notes, net of issuance costs | 0 | 559,665 | 0
Purchase of convertible note hedge | 0 | (100,625) | 0
Proceeds from sale of warrants | 0 | 51,290 | 0
At the market equity offering, net of offering costs | 0 | 0 | 37,806
Proceeds from issuances under stock-based compensation plans | 67,348 | 54,270 | 40,706
Employees’ taxes paid related to restricted stock units | (16,286) | (8,738) | (9,670)
Stock repurchases | 0 | (53,035) | 0
Change in customer funds, net | (3,699) | 3,992 | 0
Net cash provided by (used in) financing activities | 47,363 | 456,269 | (23,479)
Effect of exchange rate changes on cash and cash equivalents | (974) | 437 | 153
Net increase (decrease) in cash, cash equivalents, and restricted cash | (134,300) | 362,710 | 60,018
Cash, cash equivalents, and restricted cash at beginning of period | 489,920 | 127,210 | 67,192
Cash, cash equivalents, and restricted cash at end of period | 355,620 | 489,920 | 127,210
Reconciliation of cash, cash equivalents, and restricted cash to the Consolidated Balance Sheets: |  |  |
Cash and cash equivalents | 349,051 | 485,928 | 127,210
Restricted cash | 6,569 | 3,992 | 0
Cash, cash equivalents, and restricted cash at end of period | 355,620 | 489,920 | 127,210
Supplemental cash flow information |  |  |
Cash paid for interest | 1,917 | 522 | 3,582
Income taxes paid (refunds received), net | (1,733) | 10,343 | 7,761
Supplemental disclosure of non-cash activities |  |  |
Unpaid purchases of property and equipment | 883 | 405 | 913
Transfers between inventory and property and equipment, net | 1,876 | 0 | 1,552
Transfers from prepaid expenses to property and equipment | 0 | 0 | 3,313
Balance transfer from term loan to revolving credit facility | $ 0 | $ 0 | $ 80,000

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