Accounts Receivable - Summary of Accounts Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Notes and Loans Receivable [Line Items]
Gross accounts receivable	$ 84,323		$ 92,402
Unearned income	(3,640)		(3,728)
Allowance for doubtful accounts	(12,295)	$ (17,694)	(18,490)	$ (10,494)
Net accounts receivable	68,388		70,184
Current trade receivables	50,078		52,764
Current unearned interest income	(2,464)		(1,950)
Long-term receivables	21,950		21,148
Long-term unearned interest income	(1,176)		(1,778)
Trade Accounts Receivable
Accounts Notes and Loans Receivable [Line Items]
Current trade receivables	50,078		52,764
Long-term receivables	$ 21,950		$ 21,148