Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Operating activities
Net income	$ 78,857	$ 2,414	$ (166,181)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	82,569	109,050	112,958
Amortization related to long-term debt (see Note 14)	2,366	9,448	8,693
Gain on sales of property and equipment, net (see Note 11)	(12,617)	(66,439)	(6,930)
Deferred income taxes	5,447	16,600	8,817
Stock-based compensation	7,765	6,407	6,377
Equity in net loss from unconsolidated joint ventures	19,676	765	51,486
Net income from affiliates	(13,571)	(12,586)	(8,783)
Non-cash impairment charges (see Note 1)	0	0	156,690
Other non-cash adjustments	222	0	1,729
Changes in assets and liabilities:
Receivables	59,623	(11,317)	6,840
Contract assets, net	(113,410)	12,046	123,670
Inventories	(14,307)	774	5,136
Contributions to unconsolidated construction joint ventures	(53,787)	(61,780)	(50,878)
Distributions from unconsolidated construction joint ventures and affiliates	19,223	22,004	11,065
Deposit for legal settlement (see Note 20)	129,000	(129,000)	0
Other assets, net	16,868	(11,969)	(1,035)
Accounts payable	(9,778)	7,396	(40,999)
Accrual for legal settlement (see Note 20)	(129,000)	129,000	0
Accrued expenses and other liabilities, net	(19,499)	(882)	49,805
Net cash provided by operating activities	55,647	21,931	268,460
Investing activities
Purchases of marketable securities	(94,104)	(10,000)	(9,996)
Maturities of marketable securities	45,000	0	10,000
Proceeds from called marketable securities	6	0	24,996
Purchases of property and equipment	(121,612)	(94,810)	(93,253)
Proceeds from sales of property and equipment	26,064	94,802	16,702
Proceeds from the sale of business (see Note 2)	140,576	0	5,000
Issuance of notes receivable	(7,560)	(20,400)	5,289
Collection of notes receivable	630	8,930	0
Net cash used in investing activities	(11,000)	(21,478)	(41,262)
Financing activities
Proceeds from long-term debt	50,000	0	50,000
Debt principal repayments	(125,164)	(8,922)	(83,433)
Cash dividends paid	(23,271)	(23,804)	(23,712)
Repurchases of common stock (See Note 17)	(70,898)	(2,730)	(885)
Contributions from non-controlling partners	13,150	20,126	11,875
Distributions to non-controlling partners	(8,567)	(9,514)	(11,810)
Other financing activities, net	439	398	307
Net cash used in financing activities	(164,311)	(24,446)	(57,658)
Net increase (decrease) in cash, cash equivalents and restricted cash	(119,664)	(23,993)	169,540
Cash, cash equivalents and $1,512, $1,512 and $5,835 in restricted cash at beginning of period	413,655	437,648	268,108
Cash, cash equivalents and $0, $1,512 and $1,512 in restricted cash at end of period	293,991	413,655	437,648
Supplementary Information
Right of use assets obtained in exchange for lease obligations	17,547	23,379	10,000
Operating lease liabilities	22,611	23,203	21,654
Interest	11,511	14,593	18,753
Income taxes	3,768	2,066	2,805
Other non-cash operating activities:
Performance guarantees	(17,409)	(167)	350
Non-cash investing and financing activities:
RSUs issued, net of forfeitures	8,694	8,299	4,449
Dividends declared but not paid	5,687	5,959	5,937
Contributions from non-controlling partners	4,110	9,006	0
Accrued equipment purchases	$ 5,745	$ (4,714)	$ 0