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CONSOLIDATED STATEMENTS OF CASH FLOWS SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONSOLIDATED STATEMENTS OF CASH FLOWS NON-CASH SUPPLEMENTAL DATA |  |  |
Accrued liabilities for intangible assets | $ 9,800 | $ 12,800 | $ 10,800
Accounts payable for purchase of available-for-sale short-term investment | $ 0 | $ 8,700 | $ 0

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