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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities |  |  |
Net income (loss) | $ 37,209 | $ 27,420 | $ (459)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization expense | 71,400 | 75,260 | 74,280
Stock-based compensation expense | 16,676 | 20,817 | 22,598
Deferred income taxes | 3,693 | (4,015) | (7,065)
Provision for doubtful accounts | 6,325 | 4,089 | 4,512
Impairment of investment in Web International Education Group, Ltd. |  |  | 10,000
Other | 3,985 | 4,822 | 4,286
Changes in assets and liabilities: |  |  |
Accounts receivable | (21,637) | 11,987 | (27,745)
Inventories, prepaid expenses, deposits and other current and long-term assets | (3,321) | (28,491) | 11,343
Accounts payable | 20,174 | (2,336) | 5,317
Accrued liabilities | 8,295 | (6,273) | (4,963)
Accrued compensation and benefits | 5,948 | 6,672 | (1,674)
Deferred revenue, rent and other liabilities | (7,141) | (4,506) | (1,702)
Net cash provided by operating activities | 141,606 | 105,446 | 88,728
Cash flows from investing activities |  |  |
Purchase of property and equipment | (5,477) | (8,743) | (2,174)
Capitalized software development costs | (26,318) | (24,533) | (26,918)
Capitalized curriculum development costs | (16,611) | (9,927) | (19,132)
Sale of long-lived assets | 389 |  | 89
Acquisitions and investments | (13,092) | (7,274) | (9,063)
Net cash used in investing activities | (61,109) | (50,477) | (57,198)
Cash flows from financing activities |  |  |
Repayments on capital lease obligations | (21,034) | (13,301) | (15,697)
Payments of contingent consideration | (1,027) | (1,819) |
Purchase of treasury stock |  | (27,482) |
Proceeds from exercise of stock options | 3,030 | 196 | 6,953
Excess tax benefit from stock-based compensation |  |  | 291
Repurchase of restricted stock for income tax withholding | (9,958) | (10,314) | (6,191)
Net cash used in financing activities | (28,989) | (52,720) | (14,644)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash |  |  | (11)
Net change in cash, cash equivalents and restricted cash | 51,508 | 2,249 | 16,875
Cash, cash equivalents and restricted cash, beginning of period | 233,113 | 230,864 | 213,989
Cash, cash equivalents and restricted cash, end of period | $ 284,621 | $ 233,113 | $ 230,864

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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration