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Accounts Receivable and Allowance for Doubtful Accounts
3 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS
Accounts receivable consists of the following (in thousands):
March 31, 2021December 31, 2020
Trade accounts receivable$175,277 $174,604 
Costs in excess of billings27,640 26,915 
Total accounts receivables202,917 201,519 
Less allowance for doubtful accounts and contract assets(3,319)(3,529)
Accounts receivable, net$199,598 $197,990 

Refer to Note 4 "Revenue" concerning the Company's costs in excess of billings.

The following table provides a roll-forward of the allowance for credit losses, for the three month period ended March 31, 2021, that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected.
Beginning balance as of January 1, 2021$3,529 
Bad debt expense, net of recoveries(159)
Accounts written off against allowance and other adjustments(51)
Ending balance as of March 31, 2021$3,319