Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (25,772)	$ (25,095)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, depletion and amortization	19,733	16,737
Amortization related to long-term debt	472	652
Gain on sale of business	0	(3,278)
Gain on sales of property and equipment, net	(2,037)	(598)
Deferred income taxes	0	2,545
Stock-based compensation	4,828	2,614
Equity in net loss from unconsolidated joint ventures	(911)	3,627
Equity in income (loss) of affiliates	(5,187)	(1,289)
Other non-cash adjustments	(151)	(299)
Changes in assets and liabilities:
Receivables	66,800	85,957
Contract assets, net	(59,307)	(69,819)
Inventories	(11,083)	(13,805)
Contributions to unconsolidated construction joint ventures	(3,350)	(12,840)
Distributions from unconsolidated construction joint ventures and affiliates	2,478	250
Other assets, net	(5,724)	9,652
Accounts payable	(42,955)	(44,028)
Accrued expenses and other liabilities, net	(14,522)	(1,163)
Net cash used in operating activities	(76,688)	(50,180)
Investing activities
Purchases of marketable securities	0	(19,940)
Maturities of marketable securities	10,000	0
Purchases of property and equipment	(40,461)	(31,269)
Proceeds from sales of property and equipment	4,518	2,483
Proceeds from company owned life insurance	1,545	0
Proceeds from the sale of business	0	142,571
Issuance of notes receivable	0	(4,560)
Collection of notes receivable	62	111
Net cash provided by (used in) investing activities	(24,336)	89,396
Financing activities
Debt principal repayments	(256)	(63,059)
Cash dividends paid	(5,687)	(5,959)
Repurchases of common stock	(3,523)	(20,212)
Contributions from non-controlling partners	17,600	6,325
Distributions to non-controlling partners	(1,350)	0
Other financing activities, net	0	1
Net cash provided by (used in) financing activities	6,784	(82,904)
Net decrease in cash, cash equivalents and restricted cash	(94,240)	(43,688)
Cash, cash equivalents and $0 and $1,512 in restricted cash at beginning of period	293,991	413,655
Cash, cash equivalents and $0 and $1,512 in restricted cash at end of period	199,751	369,967
Supplementary Information
Right of use assets obtained in exchange for lease obligations	3,388	3,502
Operating lease liabilities	5,824	5,862
Interest	1,012	2,090
Income taxes	166	2
Other non-cash operating activities:
Performance guarantees	(6,513)	0
Non-cash investing and financing activities:
RSUs issued, net of forfeitures	9,552	6,606
Dividends declared but not paid	5,704	5,897
Contributions from non-controlling partners	1,324	0
Accrued equipment purchases	$ 3,693	$ 5,511