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INCOME TAX - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at the beginning of the year $ 39,408 $ 29,671 $ 21,197
Additions related to acquisitions 387 3,186 22,283
Reductions for income tax positions of prior years (10,875) (5,408) (14,235)
Settlements with income tax authorities (2,137) (909) (2,583)
Additions for income tax positions of prior years 2,289 7,968 1,803
Additions based on income tax positions related to the current year 5,833 4,900 1,206
Balance at the end of the year $ 34,905 $ 39,408 $ 29,671