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RESTRUCTURING AND INTEGRATION EXPENSE (restructuring and integration accruals) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring and integration accruals [Line Items]          
Charges $ 17,862 $ 21,551 $ 58,947 $ 79,339 $ 74,810
CEO transition costs     0 (30) 9,390 [1]
Employee severance [Member]          
Restructuring and integration accruals [Line Items]          
Balance, beginning of year     6,798 3,459 3,179
Charges     10,897 19,025 11,516
Reversals     (1,821) (1,397) (651)
Payments     (10,202) (14,289) (10,585)
Balance, end of year 5,672 6,798 5,672 6,798 3,459
Operating lease obligations [Member]          
Restructuring and integration accruals [Line Items]          
Balance, beginning of year     0 0 282
Charges         0
Reversals         0
Payments         0
Balance, end of year $ 0 $ 0 $ 0 $ 0 0
Operating lease obligations [Member] | Accounting Standards Update No. 2016-02 [Member]          
Restructuring and integration accruals [Line Items]          
Balance, beginning of year [2]         (282)
Employee severance and operating lease obligations [Member]          
Restructuring and integration accruals [Line Items]          
Balance, beginning of year         3,461
Charges         11,516
Reversals         (651)
Payments         (10,585)
Employee severance and operating lease obligations [Member] | Accounting Standards Update No. 2016-02 [Member]          
Restructuring and integration accruals [Line Items]          
Balance, beginning of year [2]         $ (282)
[1] In 2019, CEO transition costs includes share-based compensation expense related to the modification of certain awards in conjunction with our CEO transition (Note 9).
[2] Upon adoption of ASU No. 2016-02, Leasing, and related amendments on January 1, 2019, our operating lease obligation accrual was reversed and the related operating lease asset was analyzed for impairment in accordance with the new guidance.