INTANGIBLE ASSETS - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Identifiable intangible assets [Abstract]
Gross carrying amount	$ 462,186	$ 327,330
Accumulated amortization	243,384	232,665
Customer relationships & lists
Identifiable intangible assets [Abstract]
Gross carrying amount	350,523	240,059
Accumulated amortization	$ 180,638	173,489
Customer relationships & lists | Minimum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	10 years
Customer relationships & lists | Maximum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	20 years
Trademarks & trade names
Identifiable intangible assets [Abstract]
Gross carrying amount	$ 48,724	43,116
Accumulated amortization	$ 30,968	28,985
Trademarks & trade names | Minimum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	2 years
Trademarks & trade names | Maximum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	17 years
Developed technology
Identifiable intangible assets [Abstract]
Gross carrying amount	$ 38,252	20,234
Accumulated amortization	$ 14,993	14,607
Developed technology | Minimum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	5 years
Developed technology | Maximum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	12 years
Other
Identifiable intangible assets [Abstract]
Gross carrying amount	$ 24,687	23,921
Accumulated amortization	$ 16,785	$ 15,584
Other | Minimum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	2 years
Other | Maximum
Identifiable intangible assets [Abstract]
Amortization Period (in years)	18 years