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v3.8.0.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income | $ 163,945 | $ 109,857 | $ 64,869
Adjustments to reconcile net income to cash provided by operations: |  |  |
Depreciation and amortization | 53,925 | 50,301 | 19,574
Share-based compensation expense | 37,348 | 29,747 | 20,182
Provision for losses - accounts receivable | 4,110 | 4,484 | 1,756
Deferred income tax benefit | (29,865) | (28,939) | (7,956)
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |  |
Accounts receivable | (35,558) | (30,227) | (28,172)
Income tax receivable | (8,444) | 18,185 | 24,255
Prepaid expenses and other current assets | (5,897) | 2,229 | (3,054)
Accounts payable | 878 | 387 | 652
Accrued liabilities | 6,050 | 10,717 | 490
Deferred revenue | 9,263 | 25,118 | 41,731
Net cash provided by operating activities | 195,755 | 191,859 | 134,327
Cash flows from investing activities: |  |  |
Cost of acquisitions, net of cash acquired | (11,344) | (9,394) | (339,961)
Purchase of cost method investment | 0 | 0 | (15,000)
Purchase of marketable security investments | (59,779) | (20,316) | (31,907)
Proceeds from marketable security investments | 28,786 | 16,837 | 900
Additions to property and equipment | (43,057) | (37,726) | (12,501)
(Increase) decrease in other | (1) | (121) | 10
Net cash used by investing activities | (85,395) | (50,720) | (398,459)
Cash flows from financing activities: |  |  |
(Decrease) increase in net borrowings on revolving line of credit | (10,000) | (56,000) | 66,000
Purchase of treasury shares | (7,474) | (111,838) | (645)
Contributions from employee stock purchase plan | 7,044 | 6,236 | 4,671
Proceeds from exercise of stock options | 49,845 | 23,527 | 23,160
Debt issuance costs | 0 | 0 | (2,134)
Net cash provided (used) by financing activities | 39,415 | (138,075) | 91,052
Net increase (decrease) in cash and cash equivalents | 149,775 | 3,064 | (173,080)
Cash and cash equivalents at beginning of period | 36,151 | 33,087 | 206,167
Cash and cash equivalents at end of period | $ 185,926 | $ 36,151 | $ 33,087

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