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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | $ (207,197) | $ 10,903 | $ (118,222)
Adjustments to reconcile net income (loss) to cash provided by operating activities: |  |  |
Stock-based compensation | 14,179 | 31,040 | 18,416
Depreciation and amortization | 36,905 | 38,329 | 46,196
Impairment and other losses | 96,399 | 8,599 | 87,204
Adjustment to deferred acquisition consideration | 42,187 | 5,403 | (374)
Deferred income taxes (benefits) | 108,556 | 4,791 | 21,585
(Gain) loss on disposition of assets | 771 | (4,107) | 22,451
Changes in working capital: |  |  |
Accounts receivable | 72,453 | (37,763) | 31,326
Expenditures billable to clients | 19,581 | 12,236 | (11,223)
Prepaid expenses and other current assets | 24,840 | 3,474 | (17,189)
Accounts payable, accruals and other current liabilities | (144,123) | (14,077) | (18,222)
Acquisition related payments | (13,330) | (5,223) | (29,141)
Payments For (Proceeds From) Cash In Trust | 0 | 0 | (656)
Advance billings | (18,662) | 32,934 | (14,871)
Net cash provided by operating activities | 32,559 | 86,539 | 17,280
Cash flows from investing activities: |  |  |
Capital expenditures | (24,310) | (18,596) | (20,264)
Proceeds from sale of assets | 19,616 | 23,050 | 2,082
Acquisitions, net of cash acquired | (1,816) | (4,823) | (32,713)
Other | (1,777) | 484 | 464
Net cash provided by (used in) investing activities | (8,287) | 115 | (50,431)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs | 0 | 98,620 | 0
Acquisition related payments | (35,391) | (30,155) | (32,172)
Distributions to noncontrolling interests and other | (16,036) | (12,049) | (14,537)
Repurchase of Bonds | (21,999) | 0 | 0
Net cash provided by (used in) financing activities | (73,426) | (11,729) | 21,434
Effect of exchange rate changes on cash, cash equivalents, and cash held in trusts | 2,978 | 1 | 77
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents and Cash Held in Trusts Including Cash Classified Within Assets Held for Sale, Period Increase (Decrease) | (46,176) | 74,926 | (11,640)
Change in cash and cash equivalents classified within assets held for sale | 0 | 4,441 | 0
Net increase (decrease) in cash, cash equivalents, and cash held in trusts including cash classified within assets held for sale | (46,176) | 76,060 | (19,938)
Cash and cash equivalents at beginning of period | 106,933 | 30,873 | 50,811
Cash and cash equivalents at end of period | 60,757 | 106,933 | 30,873
Supplemental disclosures: |  |  |
Cash income taxes paid | 7,946 | 2,296 | 3,836
Cash interest paid | 57,752 | 62,223 | 64,012
Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Cash flows from financing activities: |  |  |
Repayment of borrowings under revolving credit facility | (550,135) | (1,303,350) | (1,625,862)
Proceeds from borrowings under revolving credit facility | 550,135 | 1,235,205 | 1,694,005
Change in cash and cash equivalents held in trusts classified within held for sale | $ 0 | $ (3,307) | $ (8,298)

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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686 + Details
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