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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities: |  |
Net loss | $ (1,945) | $ (24,427)
Adjustments to reconcile net loss to net cash flows from operating activities: |  |
Depreciation | 5,416 | 5,825
Amortization | 28,167 | 27,997
Amortization of operating lease right-of-use assets | 2,345 | 3,556
Amortization of deferred debt issuance costs | 1,182 | 1,212
Deferred income taxes | (6,078) | (10,413)
Stock-based compensation expense | 6,703 | 6,950
Other | (106) | 650
Changes in operating assets and liabilities: |  |
Receivables | 76,135 | 48,699
Accounts payable | (2,808) | (6,087)
Accrued employee compensation | (12,725) | 6,985
Deferred revenue | 8,152 | 22,495
Other current and noncurrent assets and liabilities | (34,315) | (25,942)
Net cash flows from operating activities | 70,123 | 57,500
Cash flows from investing activities: |  |
Purchases of property and equipment | (4,346) | (3,597)
Purchases of software and distribution rights | (8,053) | (6,541)
Net cash flows from investing activities | (12,399) | (10,138)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 1,052 | 947
Proceeds from exercises of stock options | 2,799 | 400
Repurchase of stock-based compensation awards for tax withholdings | (14,206) | (10,973)
Repurchases of common stock | 0 | (28,881)
Proceeds from revolving credit facility | 0 | 30,000
Repayment of revolving credit facility | (15,000) | (39,000)
Repayment of term portion of credit agreement | (9,738) | (9,737)
Payments on or proceeds from other debt, net | (3,600) | (3,593)
Net cash flows from financing activities | (38,693) | (60,837)
Effect of exchange rate fluctuations on cash | (41) | 11,201
Net increase (decrease) in cash and cash equivalents | 18,990 | (2,274)
Cash and cash equivalents, beginning of period | 165,374 | 121,398
Cash and cash equivalents, end of period | 184,364 | 119,124
Supplemental cash flow information |  |
Income taxes paid | 10,713 | 6,639
Interest paid | $ 15,954 | $ 21,837

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