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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 6 Months Ended
Jun. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
Schedule II - Valuation and Qualifying Accounts
Beginning BalanceAdditions
(Charge to Expense)		Deductions
(Write-offs, net of Recoveries)		Ending Balance
(in thousands)
Allowance for doubtful accounts, customers and other:
Year ended December 31, 2018$549 $1,725 $(1,111)$1,163 
Year ended December 31, 20191,163 1,840 (1,853)1,150 
Year ended December 31, 20201,150 1,483 (1,882)751 
Tax valuation allowances:
Year ended December 31, 2018$— $938 $— $938 
Year ended December 31, 2019938 5,638 — 6,576 
Year ended December 31, 20206,576 11,680 — 18,256