Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Disaggregation of Revenue

Disaggregation of Revenue

	Three Months Ended March 31,
	2020					2019
	Dollars		Percent			Dollars		Percent
Client Markets:
Energy, environment, and infrastructure	$	151,362		42	%	$	153,403		45	%
Health, education, and social programs		143,423		40	%		121,423		35	%
Safety and security		31,585		9	%		29,551		9	%
Consumer and financial services		31,868		9	%		36,877		11	%
Total	$	358,238		100	%	$	341,254		100	%

	Three Months Ended
	March 31, 2020					March 31, 2019
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	155,375		44	%	$	132,092		39	%
U.S. state and local government		61,330		17	%		65,950		19	%
International government		23,092		6	%		27,135		8	%
Total Government		239,797		67	%		225,177		66	%
Commercial		118,441		33	%		116,077		34	%
Total	$	358,238		100	%	$	341,254		100	%

	Three Months Ended
	March 31, 2020					March 31, 2019
	Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	168,213		47	%	$	155,182		45	%
Fixed price		133,128		37	%		134,448		40	%
Cost-based		56,896		16	%		51,624		15	%
Total	$	358,238		100	%	$	341,254		100	%

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	March 31, 2020			December 31, 2019			$ Change		% Change
Contract assets	$	151,558		$	142,337		$	9,221		6.5	%
Contract liabilities		(29,318	)		(37,413	)		8,095		(21.6	%)
Net contract assets (liabilities)	$	122,240		$	104,924		$	17,316		16.5	%