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Supplemental Cash Flow Information - Net Effects of Changes in Operating Assets and Liabilities, Net, on Cash Flows from Operating Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ (479,573)	$ (169,041)	$ (695,364)	$ (345,842)
Contract assets	34,016	(125,878)	(67,882)	(188,996)
Inventories	1,511	(8,436)	43,598	(13,841)
Prepaid expenses and other current assets	(8,048)	12,991	(110,622)	(45,002)
Accounts payable and accrued expenses and other non-current liabilities	250,608	170,469	228,473	294,259
Contract liabilities	68,535	(48,386)	112,545	22,676
Other, net	(4,957)	(2,291)	(134,305)	(8,270)
Net change in operating assets and liabilities, net of non-cash transactions	$ (137,908)	$ (170,572)	(623,557)	$ (285,016)
Payments of on-demand advance payment bonds			87,000
Payments of on-demand performance bonds			$ 25,000

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Payments For On-Demand Performance Bonds

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The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.

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The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction.

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