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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Net income (loss) |  | $ 55,181 | $ (31,897) | $ (18,712)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |  |
Asset impairment |  |  |  | 1,164
Depreciation and amortization expense |  | 9,394 | 13,990 | 22,747
Bad debt expense |  | 31,940 | 27,436 | 31,885
Compensation expense related to share-based awards |  | 5,614 | 4,970 | 3,237
Gain on disposition of property and equipment |  |  |  | (438)
Deferred income taxes |  | 17,863 | 64,225 | (18,087)
Changes in operating assets and liabilities: |  |  |  |
Student receivables, gross |  | (10,541) | 5,129 | 6,925
Allowance for doubtful accounts |  | (29,646) | (28,075) | (29,033)
Other receivables, net |  | (1,286) | (257) | 1,127
Inventories, prepaid expenses, and other current assets |  | 3,053 | 8,742 | 2,783
Deposits and other non-current assets |  | 711 | 1,706 | 1,634
Accounts payable |  | 698 | (1,588) | (16,264)
Accrued expenses and deferred rent obligations |  | (35,448) | (80,703) | 29,254
Deferred tuition revenue |  | 9,454 | (5,467) | (11,747)
Net cash provided by (used in) operating activities |  | 56,987 | (21,789) | 6,475
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |
Purchases of available-for-sale investments |  | (309,784) | (256,243) | (160,590)
Sales of available-for-sale investments |  | 275,024 | 250,928 | 126,830
Purchases of property and equipment | [1] | (6,732) | (6,332) | (4,129)
Proceeds on the sale of assets |  |  |  | 3,600
Payments of cash upon sale of businesses, net of cash divested |  |  |  | (62)
Net cash used in investing activities |  | (41,492) | (11,647) | (34,351)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |
Issuance of common stock |  | 1,682 | 2,722 | 773
Payments on borrowings |  |  |  | (38,000)
Payments of employee tax associated with stock compensation |  | (3,345) | (1,187) | (563)
Net cash (used in) provided by financing activities |  | (1,663) | 1,535 | (37,790)
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: |  |  | (82) | (192)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | 13,832 | (31,983) | (65,858)
CASH AND CASH EQUIVALENTS, beginning of the year |  | 18,899 | 50,882 | 116,740
CASH AND CASH EQUIVALENTS, end of the year |  | 32,731 | 18,899 | 50,882
Supplemental Cash Flow Information: |  |  |  |
Interest paid |  |  |  | 153
Income taxes paid |  | $ 266 | $ 120 | $ 334
[1] | The statement of income (loss) and comprehensive income (loss) balances including revenue, operating income (loss), depreciation and amortization and capital expenditures are presented above on a continuing operations basis. Total assets are presented on a consolidated basis including continuing and discontinued operations.

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