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CONSOLIDATED STATEMENTS OF CASH FLOWS Non-Cash Activities - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Significant Noncash Transactions [Line Items] |  |  |
Unrealized gain (loss) on available-for-sale securities | $ 342 | $ (19) | $ (207)
Net change in accounts payable and accrued expenses related to purchases of property and equipment | 3,490 | 4,363 | (103)
Earnout liability recorded for Adesis acquisition |  |  | 1,670
Excess tax benefits accrued for in other current liabilities |  |  | (4,232)
Cash paid for income tax | 17,771 | 23,248 | 12,870
Common Stock Issued to Board of Directors and Scientific Advisory Board that was Earned and Accrued for in Previous Period [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Other significant noncash transaction, value of consideration received | $ 300 | 300 | 300
Common Stock Issued to Employees that was Earned and Accrued for in Previous Period Net of Shares Withheld for Taxes [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Other significant noncash transaction, value of consideration received |  | $ 174 | $ 1,105

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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