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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ 1,794 | $ 316
Adjustments to reconcile net income to cash used in operating activities: |  |
Stock-based compensation | 3,070 | 2,972
Depreciation and amortization | 9,206 | 8,838
Other asset impairment | 161 | 0
Adjustment to deferred acquisition consideration | (4,600) | (7,643)
Deferred income taxes | 8,511 | 748
Other | 4,489 | (2,608)
Changes in working capital: |  |
Accounts receivable | 41,148 | (29,957)
Expenditures billable to clients | 7,370 | (4,294)
Prepaid expenses and other current assets | (3,385) | (3,373)
Accounts payable, accruals and other current liabilities | (62,120) | (75,105)
Acquisition related payments | (782) | (3,657)
Advance billings | (24,816) | 32,563
Net cash used in operating activities | (19,954) | (81,200)
Cash flows from investing activities: |  |
Capital expenditures | (1,546) | (3,606)
Proceeds from sale of assets | 18,920 | 23,050
Acquisitions, net of cash acquired | (729) | (1,050)
Other | 0 | (293)
Net cash provided by investing activities | 16,645 | 18,101
Cash flows from financing activities: |  |
Acquisition related payments | (750) | 0
Other | (4,608) | (1,536)
Net cash provided by financing activities | 119,642 | 60,753
Effect of exchange rate changes on cash, cash equivalents, and cash held in trusts | (2,164) | (576)
Net increase (decrease) in cash and cash equivalents, including cash classified within current assets held for sale | 114,169 | (2,922)
Change in cash and cash equivalents held in trusts classified within held for sale | 0 | (3,307)
Change in cash and cash equivalents classified within assets held for sale | 0 | 1,728
Net increase (decrease) in cash and cash equivalents | 114,169 | (4,501)
Cash and cash equivalents at beginning of period | 106,933 | 30,873
Cash and cash equivalents at end of period | 221,102 | 26,372
Supplemental disclosures: |  |
Cash income taxes paid | 849 | 1,677
Cash interest paid | 145 | 1,629
Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |
Cash flows from financing activities: |  |
Net increase (decrease) in revolving credit facility | 125,000 | (35,340)
Series 4 Convertible Preferred Stock |  |
Cash flows from financing activities: |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs | $ 0 | $ 97,629

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