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v3.10.0.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 147,462 | $ 169,571 | $ 113,701
Adjustments to reconcile net income to cash provided by operations: |  |  |
Depreciation and amortization | 61,759 | 53,395 | 49,773
Share-based compensation expense | 52,740 | 37,348 | 29,747
Provision for losses - accounts receivable | 2,286 | 4,110 | 4,484
Deferred income tax benefit | (5,069) | (33,664) | (26,432)
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |  |
Accounts receivable | (53,771) | (35,170) | (34,760)
Income tax receivable | 6,642 | (8,444) | 18,185
Prepaid expenses and other current assets | (588) | (6,958) | 246
Accounts payable | (2,416) | 878 | 387
Accrued liabilities | (2,445) | 6,050 | 10,717
Deferred revenue | 43,603 | 8,639 | 25,811
Net cash provided by operating activities | 250,203 | 195,755 | 191,859
Cash flows from investing activities: |  |  |
Cost of acquisitions, net of cash acquired | (178,093) | (11,344) | (9,394)
Purchase of marketable security investments | (115,625) | (59,779) | (20,316)
Proceeds from marketable security investments | 81,205 | 28,786 | 16,837
Additions to property and equipment | (27,424) | (43,057) | (37,726)
Decrease (increase) in other | 1,682 | (1) | (121)
Net cash used by investing activities | (238,255) | (85,395) | (50,720)
Cash flows from financing activities: |  |  |
Decrease in net borrowings on revolving line of credit | 0 | (10,000) | (56,000)
Purchase of treasury shares | (146,553) | (7,474) | (111,838)
Contributions from employee stock purchase plan | 8,051 | 7,044 | 6,236
Proceeds from exercise of stock options | 74,907 | 49,845 | 23,527
Net cash (used) provided by financing activities | (63,595) | 39,415 | (138,075)
Net (decrease) increase in cash and cash equivalents | (51,647) | 149,775 | 3,064
Cash and cash equivalents at beginning of period | 185,926 | 36,151 | 33,087
Cash and cash equivalents at end of period | $ 134,279 | $ 185,926 | $ 36,151

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