Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net (loss) income	$ (48,487)	$ 30,518
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	325,318	263,487
Amortization of intangible assets	126,252	81,242
Non-cash stock-based compensation expense	24,336	18,870
Benefit from deferred income taxes	(77,781)	(9,293)
Equity in earnings of unconsolidated affiliates, net	(23,434)	(19,423)
Gains on sales of assets, net	(19,082)	(21,914)
Non-cash interest expense, net	4,354	2,574
Other non-cash items, net	3,827	1,601
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(118,448)	(22,065)
Contract assets	(244,340)	(383,053)
Inventories	24,569	(36,130)
Other assets, current and long-term portion	76,234	34,060
Accounts payable and accrued expenses	104,755	293,899
Contract liabilities	70,976	(66,027)
Other liabilities, current and long-term portion	(32,477)	(49,675)
Net cash provided by operating activities	196,572	118,671
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(68,817)	(71,841)
Capital expenditures	(157,369)	(213,325)
Proceeds from sales of property and equipment	55,936	47,195
Payments for other investments	(1,899)	(3,723)
Proceeds from other investments	425	0
Other investing activities, net	41	0
Net cash used in investing activities	(171,683)	(241,694)
Cash flows from financing activities:
Proceeds from credit facilities	3,256,200	2,578,000
Repayments of credit facilities	(3,268,763)	(2,429,583)
Payments of finance lease obligations	(120,198)	(131,259)
Repurchases of common stock	0	(81,291)
Payments of acquisition-related contingent consideration	(21,638)	(35,149)
Payments for acquisition-related contingent assets	0	(17,636)
Payments to non-controlling interests, including acquisition of interests and distributions	(11,660)	0
Payments for stock-based awards	(10,293)	(4,061)
Other financing activities, net	(5,235)	(18,499)
Net cash used in financing activities	(181,587)	(139,478)
Effect of currency translation on cash	280	(2,559)
Net decrease in cash and cash equivalents	(156,418)	(265,060)
Cash and cash equivalents - beginning of period	370,592	360,736
Cash and cash equivalents - end of period	214,174	95,676
Supplemental cash flow information:
Interest paid	187,353	69,327
Income taxes paid, net of refunds	15,023	1,827
Supplemental disclosure of non-cash information:
Additions to property and equipment from finance leases	$ 113,195	$ 184,700