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REVENUE RECOGNITION AND RECEIVABLES - Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable
Gross accounts receivable	$ 121,000	$ 67,100
Allowance for credit loss	14,300	12,100
Customer receivable, current	3,430	1,227
Customer receivable - long term	33,096	9,614
Retained earnings	504,966	516,901
FirstNet agreement
Accounts Receivable
Customer receivable	36,500	10,800
Customer receivable, current	3,400	1,200
Customer receivable - long term	$ 33,100	$ 9,600
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13
Accounts Receivable
Retained earnings			$ 0

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