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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
(in thousands)

 AdditionsDeductions
Balance at Beginning of YearCharged / (Credited) to
Bad Debt Expense		Accounts Receivable
Written Off		Balance at
End of
Year
Allowance for doubtful accounts:
Year ended December 31, 2018$17,205 $10,082 $(5,563)$21,724