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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |  |  |
Net loss | $ 2,508 | $ 7,333 | $ 4,302 | $ 7,649 |  |
Adjustments to reconcile net income to cash used in operating activities: |  |  |  |  |  |
Stock-based compensation | 1,039 | 3,634 | 4,109 | 6,606 |  |
Depreciation and amortization |  |  | 18,105 | 19,501 |  |
Impairment and other losses | 18,839 | 0 | 19,000 | 0 | $ 8,599 | $ 87,204
Adjustment to deferred acquisition consideration |  |  | (2,288) | (5,570) |  |
Deferred income taxes |  |  | 2,114 | 2,835 |  |
Foreign exchange and other |  |  | (4,578) | (6,721) |  |
Changes in working capital: |  |  |  |  |  |
Accounts receivable |  |  | 88,039 | (21,570) |  |
Expenditures billable to clients |  |  | 10,707 | 1,763 |  |
Prepaid expenses and other current assets |  |  | (4,363) | (3,345) |  |
Accounts payable, accruals and other current liabilities |  |  | (127,188) | (66,343) |  |
Acquisition related payments |  |  | (6,215) | (4,376) |  |
Advance billings |  |  | (35,422) | 29,334 |  |
Net cash used in operating activities |  |  | (33,678) | (40,237) |  |
Cash flows from investing activities: |  |  |  |  |  |
Capital expenditures | (2,144) | (4,317) | (3,690) | (7,923) |  |
Proceeds from sale of assets |  |  | 19,616 | 23,050 |  |
Acquisitions, net of cash acquired |  |  | (729) | (5,130) |  |
Other investments |  |  | (554) | (179) |  |
Net cash provided by investing activities |  |  | 14,643 | 9,818 |  |
Cash flows from financing activities: |  |  |  |  |  |
Acquisition related payments |  |  | (30,885) | (24,219) |  |
Other |  |  | (11,050) | (8,091) |  |
Repurchase of Senior Notes |  |  | (21,999) | 0 |  |
Net cash provided by (used in) financing activities |  |  | (1,434) | 25,712 |  |
Effect of exchange rate changes on cash, cash equivalents, and cash held in trusts |  |  | (981) | 4 |  |
Net decrease in cash and cash equivalents, including cash classified within current assets held for sale |  |  | (21,450) | (4,703) |  |
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 |  |  | (21,450) | (3,569) |  |
Cash and cash equivalents at beginning of period |  |  | 106,933 | 30,873 | 30,873 |
Cash and cash equivalents at end of period | $ 85,483 | $ 27,304 | 85,483 | 27,304 | $ 106,933 | $ 30,873
Supplemental disclosures: |  |  |  |  |  |
Cash income taxes paid |  |  | 2,566 | 3,494 |  |
Cash interest paid |  |  | 28,736 | 31,643 |  |
Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |
Repayments of borrowings under revolving credit facility |  |  | (251,328) | (834,538) |  |
Proceeds from borrowings under revolving credit facility |  |  | 313,828 | 793,940 |  |
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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