Accounts Receivable and Allowance for Doubtful Accounts - Schedule of Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Trade accounts receivable	$ 156,399	$ 133,238
Costs in excess of billings	21,834	20,607
Total accounts receivables	178,233	153,845
Less allowance for doubtful accounts and contract assets	(5,781)	(6,330)
Accounts receivable	$ 172,452	$ 147,515