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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 48,957 | $ 35,872
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 11,676 | 11,279
Bad debt expense, net of recoveries | 3,172 | 2,439
Adjustment to contingent earnout liability | 3,050 | (756)
Stock-based compensation expense | 3,850 | 2,790
Other noncash adjustments | (2,840) | (1,115)
Changes in assets and liabilities, net of acquisitions and divestitures: |  |
Accounts receivable, net | (44,774) | (40,997)
Other assets | (4,955) | (263)
Accounts payable | 18,796 | 14,376
Income taxes payable | 10,245 | 8,762
Accrued personnel costs | (3,302) | (9,598)
Other liabilities | (2,617) | 1,989
Operating cash flows provided by continuing operations | 41,258 | 24,778
Operating cash flows used in discontinued operations | (152) | (540)
Net cash provided by operating activities | 41,106 | 24,238
Cash flows from investing activities: |  |
Business acquisitions and purchases of client lists, net of cash acquired | (23,740) | (26,561)
Purchases of client fund investments | (10,345) | (11,788)
Proceeds from the sales and maturities of client fund investments | 7,273 | 4,375
Increase in funds held for clients | 74,428 | 72,417
Additions to property and equipment, net | (5,493) | (6,749)
Collection of notes receivable | 348 | 63
Net cash provided by investing activities | 42,471 | 31,757
Cash flows from financing activities: |  |
Proceeds from bank debt | 439,000 | 308,000
Payment of bank debt | (437,300) | (288,800)
Payment for acquisition of treasury stock | (4,409) | (5,675)
Decrease in client funds obligations | (71,293) | (65,041)
Proceeds from exercise of stock options | 4,425 | 5,649
Payment of contingent consideration for acquisitions | (4,632) | (5,211)
Other, net | (1,321) | (206)
Net cash used in financing activities | (75,530) | (51,284)
Net increase in cash, cash equivalents and restricted cash | 8,047 | 4,711
Cash, cash equivalents and restricted cash at beginning of year | 33,409 | 31,374
Cash, cash equivalents and restricted cash at end of period | $ 41,456 | $ 36,085

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