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CONSOLIDATED STATEMENTS OF CASH FLOWS SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
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