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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (10,352) | $ (20,238)
Adjustments to reconcile net loss to net cash flows from operating activities: |  |
Depreciation | 11,752 | 11,831
Amortization | 57,762 | 42,799
Amortization of operating lease right-of-use assets | 8,801 | 7,029
Amortization of deferred debt issuance costs | 2,416 | 1,683
Deferred income taxes | (4,742) | (41,331)
Stock-based compensation expense | 14,882 | 20,957
Other | 1,772 | 1,533
Changes in operating assets and liabilities, net of impact of acquisitions: |  |
Receivables | 29,053 | 88,596
Accounts payable | 6,287 | 1,294
Accrued employee compensation | 8,177 | (1,163)
Current income taxes | (9,367) | (5,634)
Deferred revenue | 22,236 | (17,981)
Other current and noncurrent assets and liabilities | (13,148) | (32,510)
Net cash flows from operating activities | 125,529 | 56,865
Cash flows from investing activities: |  |
Purchases of property and equipment | (10,615) | (9,915)
Purchases of software and distribution rights | (15,057) | (11,300)
Acquisition of businesses, net of cash acquired | 0 | (758,546)
Net cash flows from investing activities | (25,672) | (779,761)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 1,894 | 1,753
Proceeds from exercises of stock options | 1,122 | 5,816
Repurchase of stock-based compensation awards for tax withholdings | (11,124) | (2,809)
Repurchases of common stock | (28,881) | (631)
Proceeds from revolving credit facility | 30,000 | 250,000
Repayment of revolving credit facility | (69,000) | (15,000)
Proceeds from term portion of credit agreement | 0 | 500,000
Repayment of term portion of credit agreement | (19,475) | (9,424)
Payments of Debt Issuance Costs | 0 | (12,830)
Payments on or proceeds from other debt, net | (4,686) | (2,220)
Net cash flows from financing activities | (100,150) | 714,655
Effect of exchange rate fluctuations on cash | 8,118 | (865)
Net increase (decrease) in cash and cash equivalents | 7,825 | (9,106)
Cash and cash equivalents, beginning of period | 121,398 | 148,502
Cash and cash equivalents, end of period | 129,223 | 139,396
Supplemental cash flow information |  |
Income taxes paid | 12,121 | 15,476
Interest paid | $ 29,026 | $ 23,937

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