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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Operating activities |  |
Net (loss) income | $ (61,013) | $ 1,791
Adjustments to reconcile net (loss) income to cash provided by operating activities |  |
Stock-based compensation | 38,397 | 31,165
Amortization and depreciation | 33,788 | 20,921
Foreign currency transaction loss (gain) | 1,607 | (159)
Other non-cash | (230) | (846)
Change in operating assets and liabilities, net | (4,829) | 22,560
Cash provided by operating activities | 7,720 | 75,432
Investing activities |  |
Purchases of investments | (10,497) | (51,395)
Proceeds from maturities and called investments | 13,545 | 11,546
Sales of investments | 29,965 | 0
Payments for acquisitions, net of cash acquired | (10,921) | 0
Investment in property and equipment | (4,882) | (6,520)
Cash provided by (used in) investing activities | 17,210 | (46,369)
Financing activities |  |
Dividend payments to shareholders | (4,730) | (4,702)
Common stock repurchases | (39,637) | (41,123)
Cash (used in) financing activities | (44,367) | (45,825)
Effect of exchange rate changes on cash and cash equivalents | 515 | (1,226)
Net (decrease) in cash and cash equivalents | (18,922) | (17,988)
Cash and cash equivalents, beginning of period | 114,422 | 162,279
Cash and cash equivalents, end of period | $ 95,500 | $ 144,291

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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