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Accounts Receivable
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE, NET
Accounts receivable at December 31 consisted of the following (in thousands):
20202019
Trade accounts receivable$174,604 $119,239 
Costs in excess of billings26,915 20,607 
Total accounts receivables201,519 139,846 
Less allowance for doubtful accounts(3,529)(5,951)
Accounts receivable, net$197,990 $133,895 

Refer to Note 3 "Revenue" concerning the Company's costs in excess of billings. The Company's accounts receivable balance as of December 31, 2020 primarily increased from December 31, 2019 due to acquired receivables of approximately $62 million during 2020. Refer to Note 6 "Acquisitions" for additional information concerning the Company's acquisitions.

The Company considered the current and expected future economic and market conditions surrounding the COVID-19 pandemic and determined that the estimate of credit losses was not significantly impacted as of December 31, 2020.