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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets, Current	$ 3,806,423		$ 3,806,423		$ 3,510,986
Liabilities, Current	2,541,372		2,541,372		2,109,856
REVENUE	$ 1,276,427	$ 1,125,275	$ 2,527,156	$ 2,083,762
Newark Airport Terminal One Design Build Project [Member]
Variable Interest Entity [Line Items]
Percent interest in the joint venture			80.00%
Purple Line Extension Section 2 And Section 3 [Member]
Variable Interest Entity [Line Items]
Percent interest in the joint venture			75.00%
Joint Venture With O&G Industries [Member] \| Scenario, Plan [Member] \| Purple Line Extension Section 2 And Section 3 [Member]
Variable Interest Entity [Line Items]
REVENUE			$ 2,800,000
Parsons Corporation [Member] \| Newark Airport Terminal One Design Build Project [Member]
Variable Interest Entity [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	20.00%		20.00%
O&G [Member] \| Purple Line Extension Section 2 And Section 3 [Member]
Variable Interest Entity [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	25.00%		25.00%
Joint Venture With Parsons [Member] \| Scenario, Plan [Member] \| Newark Airport Terminal One Design Build Project [Member]
Variable Interest Entity [Line Items]
REVENUE			$ 1,400,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets, Current	$ 3,400		3,400		1,500
Liabilities, Current	3,300		3,300		1,400
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets, Current	401,100		401,100		365,000
Assets, Noncurrent	36,400		36,400		52,000
Liabilities, Current	$ 581,100		$ 581,100		$ 556,100