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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ 76,512	$ 237,790	$ 112,033	$ 360,120
Contract assets	(150,148)	83,677	(212,426)	100,049
Inventories	(5,709)	2,500	(6,144)	(1,868)
Prepaid expenses and other current assets	(52,297)	(33,600)	(42,349)	50,478
Accounts payable and accrued expenses and other non-current liabilities	63,982	22,649	59,202	(87,745)
Contract liabilities	3,595	19,283	(25,630)	6,397
Other, net	(978)	(6,591)	(9,178)	(12,253)
Net change in operating assets and liabilities, net of non-cash transactions	$ (65,043)	$ 325,708	$ (124,492)	$ 415,178

X

- Definition

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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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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