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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net loss continuing operations | $ (10,358) | $ (103,467) | $ (245,280)
Gain (loss) on Sale of discontinued operations, net of tax | 0 | 0 | 18,288
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 42,672 | 77,037 | 97,092
Goodwill impairment | 0 | 0 | 9,100
Impairment of long-lived assets and capitalized software | 1,013 | 0 | 11,462
Change in fair value of financial instruments | 0 | (163) | (3,849)
Amortization of debt issuance costs | 0 | 285 | 1,294
(Gain) loss on extinguishment of debt | 0 | (822) | (1,760)
Accrued PIK interest | 0 | 0 | (7,037)
Allowance for loan losses | 0 | 0 | 84,314
Loss (earnings) from Equity method investments | 0 | 1,619 | 28,600
(Gain) loss on Disposals of fixed assets | 12 | 15 | 277
(Gain) loss on Disposals of intangible assets | (3,477) | (5,429) | 0
Amortization of bond premium | 0 | (34) | 107
Deferred income taxes | (911) | 357 | (12,350)
Stock-based compensation | 11,137 | 22,287 | 27,604
Cumulative adjustment to STI receivable | 0 | 26,044 | 0
Operating lease impairment | 5,350 | 6,268 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | 11,703 | 10,891 | (21,521)
Prepaid expenses and other current assets | (1,641) | 18,209 | (5,315)
Accounts payable | (7,127) | 8,879 | 6,846
Accrued expenses | 898 | 2,115 | (18,068)
Other assets | 0 | 1,710 | 973
Deferred revenues | (43,200) | (28,856) | 2,529
Other liabilities | (6,635) | (4,362) | (4,675)
Net cash provided by (used in) operating activities | (564) | 32,583 | (31,369)
Investing activities: |  |  |
Purchases of fixed assets | (885) | (8,183) | (11,656)
Additions to capitalized software | (16,665) | (13,008) | (14,372)
Acquisition of intangible assets | (400) | 0 | 0
Proceeds from the sale of intangibles | 3,600 | 5,429 | 0
Purchases of marketable securities available for sale | 0 | (51,745) | (36,789)
Maturity of marketable securities available for sale | 11 | 86,884 | 4,865
Equity investment | 0 | 0 | 404
Business acquired, net of cash | 0 | 0 | (9,734)
Net cash provided by (used in) investing activities | (14,339) | 19,377 | (67,282)
Financing activities: |  |  |
Share-based compensation-related proceeds, net of taxes paid on withholding shares | 0 | 39 | 0
Taxes paid on withholding shares | (9) | (15) | 0
Retirement of Convertible Senior Notes & related costs | 0 | (113,006) | (113,696)
Borrowings on revolving line of credit | 10,000 | 2,000 | 0
Repayment of revolving line of credit | 0 | (2,000) | 0
Proceeds from issuance of preferred stock | 0 | 0 | 86,220
Preferred dividend payment | 0 | (7,075) | (7,075)
Payments on capital obligations | 0 | (1,200) |
Payments on capital obligations |  |  | (1,334)
Net cash provided by (used in) financing activities | 9,991 | (121,257) | (35,885)
Effect of exchange rate changes on cash | (418) | (1,562) | (1,729)
Net decrease in cash and cash equivalents | (5,330) | (70,859) | (136,265)
Cash and cash equivalents, beginning of period | 39,001 | 109,860 | 246,125
Cash and cash equivalents, end of period | 33,671 | 39,001 | 109,860
Supplemental disclosures of cash flow information: |  |  |
Cash paid for income taxes | 6,138 | 3,598 | 22,549
Cash refund for income taxes | 15,585 | 20,733 | 0
Cash paid for interest | 212 | 666 | 3,258
Supplemental disclosures of non-cash investing and financing activities: |  |  |
Paid in kind dividends on Series A Convertible Participating Perpetual Preferred Stock | $ 36,776 | $ 14,407 | $ 7,075

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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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