Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Revenue by Contract Type [Table Text Block]

	Three months ended March 31,
	2022		2021
Cost-reimbursable	$	465,977	$	419,775
Time-and-materials	115,744		81,241
Fixed-price	93,824		132,208
Revenue	$	675,545	$	633,224

Revenue by Customer [Table Text Block]

	Three months ended March 31,
	2022		2021
U.S. Government	$	668,408	$	628,498
State agencies, international agencies and commercial entities	7,137		4,726
Revenue	$	675,545	$	633,224

Revenue by Contractor Type [Table Text Block]

	Three months ended March 31,
	2022		2021
Prime contractor	$	623,192	$	589,074
Subcontractor	52,353		44,150
Revenue	$	675,545	$	633,224

Schedule Of Contract Receivables [Table Text Block]

The components of our receivables are as follows (in thousands):

	March 31, 2022		December 31, 2021
Billed receivables	$	352,496	$	370,115
Unbilled receivables	130,842		118,387
Allowance for doubtful accounts	(12,232)		(12,467)
Receivables—net	$	471,106	$	476,035

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table discloses when we expect to recognize the remaining performance obligation as revenue (in billions):

For the remaining nine months ending December 31, 2022		For the year ending
		December 31, 2023		December 31, 2024		Thereafter
$	1.3	$	0.4	$	0.3	$	0.2