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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ 19,106 | $ 13,162
Adjustments to reconcile net income to cash used in operating activities: |  |
Stock-based compensation | 10,568 | 12,632
Depreciation and amortization | 27,437 | 28,869
Impairment and other losses | 19,159 | 1,944
Adjustment to deferred acquisition consideration | 515 | (3,627)
Deferred income taxes | 2,263 | 6,292
Gain on sale of assets and other | (4,199) | (2,649)
Changes in working capital: |  |
Accounts receivable | 43,708 | 835
Expenditures billable to clients | 8,248 | 3,716
Prepaid expenses and other current assets | 1,991 | 3,280
Accounts payable, accruals and other current liabilities | (109,256) | (96,527)
Acquisition related payments | (7,514) | (4,816)
Advance billings | (14,517) | 31,049
Net cash used in operating activities | (2,491) | (5,840)
Cash flows from investing activities: |  |
Capital expenditures | (11,474) | (13,786)
Proceeds from sale of assets | 19,616 | 23,050
Acquisitions, net of cash acquired | (1,816) | (5,778)
Other | (1,777) | (179)
Net cash provided by investing activities | 4,549 | 3,307
Cash flows from financing activities: |  |
Acquisition related payments | (35,331) | (30,155)
Distributions to noncontrolling interests and other | (14,639) | (10,615)
Repurchase of Senior Notes | (21,999) | 0
Net cash used in financing activities | (71,969) | (2,202)
Effect of exchange rate changes on cash, cash equivalents, and cash held in trusts | 53 | 8
Net decrease in cash and cash equivalents, including cash classified within current assets held for sale | (69,858) | (4,727)
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 | 4,441
Net decrease in cash and cash equivalents | (69,858) | (3,593)
Cash and cash equivalents at beginning of period | 106,933 | 30,873
Cash and cash equivalents at end of period | 37,075 | 27,280
Supplemental disclosures: |  |
Cash income taxes paid | 2,700 | 3,631
Cash interest paid | 29,311 | 32,525
Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |
Cash flows from financing activities: |  |
Repayments of borrowings under revolving credit facility | (456,428) | (1,172,909)
Proceeds from borrowings under revolving credit facility | 456,428 | 1,112,857
Series 4 Convertible Preferred Stock |  |
Cash flows from financing activities: |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs | $ 0 | $ 98,620

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