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Receivables
12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Receivables Receivables
Receivables as of December 31, 2021 and 2020 are as follows:
(in thousands)20212020
Receivables
Trade$142,297 $87,048 
Other10,591 8,939 
Unbilled Receivables23,901 21,187 
Total Receivables176,789 117,174 
Less Allowance for Credit Losses(1,836)(3,215)
Receivables, net of allowance for credit losses$174,953 $113,959 
The following is a summary of activity in the allowance for credit losses for the years ended December 31, 2021 and 2020:
(in thousands)20212020
Beginning Balance$3,215 $1,339 
Additions Charged to Expense93 3,138 
Reductions for Amounts Written-Off, Net of Recoveries(1,472)(1,262)
Ending Balance$1,836 $3,215