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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ (56,322)	$ (45,089)	$ (215,791)	$ (176,801)
Contract assets	(107,165)	(56,934)	(101,898)	(63,118)
Inventories	13,091	8,277	42,087	(5,405)
Prepaid expenses and other current assets	(73,235)	(39,251)	(102,574)	(57,993)
Accounts payable and accrued expenses and other non-current liabilities	44,543	151,001	(22,135)	123,790
Contract liabilities	67,390	(6,212)	44,010	71,062
Other, net	(123,795)	(8,642)	(129,348)	(5,979)
Net change in operating assets and liabilities, net of non-cash transactions	(235,493)	$ 3,150	(485,649)	$ (114,444)
Payments of on-demand advance payment bonds	87,000		87,000
Payments of on-demand performance bonds	$ 25,000		$ 25,000

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- Definition

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.

+ References

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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.

+ References

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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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Amount of increase (decrease) in prepaid expenses, and assets 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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