ACCOUNTS RECEIVABLE AND RELATED ALLOWANCE FOR DOUBTFUL ACCOUNTS AND SALES RESERVES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable
Accounts receivable	$ 291,128	$ 295,013
Allowance for doubtful accounts and sales reserves	(15,084)	(18,911)
Accounts receivable, net of allowance for doubtful accounts and sales reserves	276,044	276,102
Allowance for Doubtful Accounts
Balance At Beginning Of Year	14,458	8,265	$ 9,419
Additions Charged To Costs And Expenses	3,173	16,349	4,549
Deductions From Reserves	(7,682)	(10,156)	(5,703)
Balance At End Of Year	9,949	14,458	8,265
Allowance for Sales Reserves
Balance At Beginning Of Year	4,452	9,250	7,271
Additions Charged To Revenues	5,586	8,768	11,394
Deductions From Reserves	(4,903)	(13,566)	(9,415)
Balance At End Of Year	$ 5,135	$ 4,452	$ 9,250