Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Operating activities
Net income (loss)	$ 2,414	$ (166,181)	$ (56,702)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	109,050	112,958	121,993
Amortization related to the 2.75% Convertible Notes (see Note 14)	9,448	8,693	1,425
Gain on sales of property and equipment, net (see Note 11)	(66,439)	(6,930)	(18,703)
Deferred income taxes	16,600	8,817	(22,924)
Stock-based compensation	6,407	6,377	10,213
Equity in net loss from unconsolidated joint ventures	765	51,486	120,632
Net income from affiliates	(12,586)	(8,783)	(11,454)
Non-cash impairment charges (see Note 2)	0	156,690	0
Other non-cash adjustments	0	1,729	4,020
Changes in assets and liabilities:
Receivables	(11,317)	6,840	(58,947)
Contract assets, net	12,046	123,670	(40,084)
Inventories	774	5,136	380
Contributions to unconsolidated construction joint ventures	(61,780)	(50,878)	(83,765)
Distributions from unconsolidated construction joint ventures and affiliates	22,004	11,065	19,064
Deposit for legal settlement (see Note 20)	(129,000)	0	0
Other assets, net	(11,969)	(1,035)	(3,928)
Accounts payable	7,396	(40,999)	140,027
Accrual for legal settlement (see Note 20)	129,000	0	0
Accrued expenses and other liabilities, net	(882)	49,805	(9,809)
Net cash provided by operating activities	21,931	268,460	111,438
Investing activities
Purchases of marketable securities	(10,000)	(9,996)	0
Maturities of marketable securities	0	10,000	30,000
Proceeds from called marketable securities	0	24,996	5,000
Purchases of property and equipment	(94,810)	(93,253)	(106,828)
Proceeds from sales of property and equipment (see Note 11)	94,802	16,702	37,091
Cash paid to purchase business	0	0	(6,227)
Proceeds from the sale of a business	0	5,000	0
Issuance of notes receivable, net of collection	(11,470)	5,289	721
Other investing activities, net	0	0	(79)
Net cash used in investing activities	(21,478)	(41,262)	(40,322)
Financing activities
Proceeds from debt	0	50,000	105,574
Proceeds from issuance of 2.75% Convertible Notes	0	0	230,000
Proceeds from issuance of warrants	0	0	11,500
Purchase of Hedge Option, net	0	0	(37,375)
Debt principal repayments	(8,922)	(83,433)	(313,150)
Cash dividends paid	(23,804)	(23,712)	(24,316)
Repurchases of common stock	(2,730)	(885)	(36,900)
Contributions from non-controlling partners	20,126	11,875	68
Distributions to non-controlling partners	(9,514)	(11,810)	(12,235)
Debt issuance costs	0	0	(6,507)
Other financing activities, net	398	307	1,704
Net cash used in financing activities	(24,446)	(57,658)	(81,637)
Net increase (decrease) in cash, cash equivalents and restricted cash	(23,993)	169,540	(10,521)
Cash, cash equivalents, and restricted cash	437,648	268,108	278,629
Cash, cash equivalents, and restricted cash	413,655	437,648	268,108
Cash, cash equivalents, and restricted cash	(18,008)	(12,356)	(15,763)
Cash and cash equivalents	395,647	425,292	252,345
Supplementary Information
Right of use assets obtained in exchange for lease obligations	23,379	10,000	25,360
Cash paid for operating lease liabilities	23,203	21,654	18,660
Cash paid during the period for:
Interest	14,593	18,753	17,322
Income taxes	2,066	2,805	11,898
Other non-cash operating activities:
Performance guarantees	(167)	350	(6,284)
Non-cash investing and financing activities:
Reclassification of the equity portion of the 2.75% Convertible Notes from debt to equity (See Note 14)	0	0	37,375
RSUs issued, net of forfeitures	8,299	4,449	8,596
Dividends declared but not paid	5,959	5,937	5,915
Contributions from non-controlling partners	$ 9,006	$ 0	$ 0
The 2.75% Convertible Notes [Member]
Interest rate	2.75%	2.75%
Convertible Debt [Member] | The 2.75% Convertible Notes [Member]
Interest rate	2.75%	2.75%	2.75%