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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 $ 48,918 $ 58,819 $ 62,288
Additions based on tax positions related to the current year 2,225 1,422 3,885
Reductions due to lapse of applicable statutes of limitation (8,356) (11,323) (7,354)
Gross balance at December 31 42,787 48,918 58,819
Interest and penalties 4,491 4,772 4,594
Balance at December 31 $ 47,278 $ 53,690 $ 63,413