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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 31,880 | $ 38,630
Adjustments to reconcile net income to net cash provided by operating activities- |  |
Depreciation | 11,199 | 10,554
Amortization | 22,043 | 24,625
Amortization of original issue discount | 1,470 | 1,390
Asset impairment | 10,595 | 365
Gain on short-term investments and other | (110) | (170)
Deferred income taxes | 6,771 | 4,181
Stock-based compensation | 10,112 | 8,500
Changes in operating assets and liabilities, net of acquired amounts: |  |
Trade accounts receivable, net | (6,286) | (31,751)
Other current and non-current assets and liabilities | (8,951) | (16,222)
Income taxes payable/receivable | 1,332 | (315)
Trade accounts payable and accrued liabilities | (36,381) | (17,328)
Deferred revenue | 6,803 | 5,970
Net cash provided by operating activities | 50,477 | 28,429
Cash flows from investing activities: |  |
Purchases of software, property and equipment | (14,334) | (17,858)
Purchases of short-term investments | (35,112) | (22,542)
Proceeds from sale/maturity of short-term investments | 34,185 | 28,753
Acquisition of and investments in business, net of cash acquired | (9,991) | (4,000)
Net cash used in investing activities | (25,252) | (15,647)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 1,247 | 1,115
Payment of cash dividends | (15,856) | (14,808)
Repurchase of common stock | (14,515) | (20,741)
Payments on long-term debt | (4,687) | (3,750)
Net cash used in financing activities | (33,811) | (38,184)
Effect of exchange rate fluctuations on cash | (3,943) | (98)
Net decrease in cash and cash equivalents | (12,529) | (25,500)
Cash and cash equivalents, beginning of period | 156,548 | 139,277
Cash and cash equivalents, end of period | 144,019 | 113,777
Cash paid during the period for- |  |
Interest | 7,327 | 8,110
Income taxes | $ 2,865 | $ 10,244

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