Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net income (loss)	$ (49,618)	$ (5,517)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, depletion and amortization	41,528	32,328
Amortization related to long-term debt	988	1,423
Loss on debt extinguishment	51,052	0
Gain on sale of business	0	(6,234)
Gain on sales of property and equipment, net	(5,981)	(9,513)
Deferred income taxes	0	2,545
Stock-based compensation	6,702	4,376
Equity in net loss from unconsolidated joint ventures	4,005	17,228
Net income from affiliates	(12,231)	(6,165)
Other non-cash adjustments	(7)	(84)
Changes in assets and liabilities:
Receivables	(171,469)	(69,114)
Contract assets, net	(46,469)	(71,282)
Inventories	(3,439)	(18,618)
Contributions to unconsolidated construction joint ventures	(14,710)	(33,563)
Distributions from unconsolidated construction joint ventures and affiliates	6,246	6,522
Other assets, net	(6,464)	22,053
Accounts payable	51,552	17,983
Accrual for expected resolution of SEC investigation	0	12,000
Accrued expenses and other liabilities, net	29,367	354
Net cash used in operating activities	(118,948)	(103,278)
Investing activities
Purchases of marketable securities	0	(49,968)
Maturities of marketable securities	30,000	0
Purchases of property and equipment	(79,689)	(73,216)
Proceeds from sales of property and equipment	10,564	15,289
Proceeds from company owned life insurance	1,545	0
Proceeds from the sale of business	0	142,571
Acquisition of business	(26,933)	0
Issuance of notes receivable	0	(4,560)
Collection of notes receivable	135	201
Net cash provided by (used in) investing activities	(64,378)	30,317
Financing activities
Proceeds from long-term debt	55,000	50,000
Debt principal repayments	(249,589)	(124,660)
Capped call transactions	(53,035)	0
Redemption of warrants	(13,201)	0
Proceeds from issuance of 3.75% Convertible Notes	373,750	0
Debt issuance costs	(9,806)	0
Cash dividends paid	(11,391)	(11,857)
Repurchases of common stock	(3,766)	(70,374)
Contributions from non-controlling partners	22,400	6,327
Distributions to non-controlling partners	(6,850)	(6,700)
Other financing activities, net	269	209
Net cash provided by (used in) financing activities	103,781	(157,055)
Net decrease in cash, cash equivalents and restricted cash	(79,545)	(230,016)
Cash, cash equivalents and $0 and $1,512 in restricted cash at beginning of period	293,991	413,655
Cash, cash equivalents and $0 in restricted cash at end of period	214,446	183,639
Supplementary Information
Right of use assets obtained in exchange for lease obligations	19,558	8,167
Operating lease liabilities	11,351	11,667
Interest	5,531	6,786
Income taxes	4,851	1,553
Other non-cash operating activities:
Performance guarantees	(6,513)	(4,678)
Deferred taxes related to capped call transactions	13,656	0
Non-cash investing and financing activities:
RSUs issued, net of forfeitures	10,981	7,688
Dividends declared but not paid	5,709	5,730
Contributions from non-controlling partners	1,822	3,274
Accrued equipment purchases	$ (4,330)	$ (5,149)