ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Goodwill	$ 986,779	$ 898,521
2021 Acquisitions
Assets
Cash and equivalents	3,852
Accounts receivable	5,208
Inventories	606
Other Receivable	286
Prepaid and other	2,051
Property, plant and equipment	16,259
Goodwill	110,135
Intangible assets	63,808
Operating lease right-of-use assets	2,309
Other miscellaneous assets	100
Liabilities
Current maturities of long-term obligations, net of unamortized debt issuance costs	1,410
Accounts payable, accrued and other liabilities	9,663
Deferred income taxes	16,792
Operating lease liabilities	2,306
Deferred and other non-current liabilities	5,770
Net assets acquired	$ 168,673
2020 Acquisitions
Assets
Cash and equivalents		1,010
Accounts receivable		4,380
Inventories		386
Other Receivable		0
Prepaid and other		1,090
Property, plant and equipment		2,885
Goodwill		103,130
Intangible assets		79,900
Operating lease right-of-use assets		4,744
Other miscellaneous assets		65
Liabilities
Current maturities of long-term obligations, net of unamortized debt issuance costs		0
Accounts payable, accrued and other liabilities		5,641
Deferred income taxes		0
Operating lease liabilities		4,207
Deferred and other non-current liabilities		322
Net assets acquired		$ 187,420