BUSINESS DESCRIPTION & SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity in the entity's accounts receivable allowance
Balance at beginning of year	$ 9,136	$ 4,549	$ 4,421
Provision charged to expense	7,752	11,573	9,347
Write-offs, less recoveries	(6,927)	(7,130)	(9,219)
Balance at end of year	$ 9,961	9,136	$ 4,549
Adjustment | ASU 2016-13
Activity in the entity's accounts receivable allowance
Cumulative adjustment upon adoption of ASU 2016-13		144
Cumulative adjustment to retained earnings		300
Decrease in value of partnership interests		$ 200