Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 76,077	$ 101,806	$ 93,543
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	182,972	156,612	148,761
Accretion of asset retirement obligation	3,977	3,232	2,709
Stock-based compensation	9,168	9,830	9,358
Amortization of deferred lease income	0	0	(2,685)
Income attributable to sale of tax benefits, net of interest expense	(12,201)	(12,090)	(10,084)
Equity in losses (earnings) of investees, net	2,624	(92)	(1,853)
Mark-to-market of derivative instruments	741	(1,192)	(1,402)
Loss (gain) on severance pay fund asset	(1,335)	(893)	(1,016)
Deferred income tax provision	(3,115)	5,102	27,896
Liability for unrecognized tax benefits	3,760	(12,673)	2,874
Deferred lease revenues	0	0	(574)
Other	526	338	914
Changes in operating assets and liabilities, net of businesses acquired:
Receivables	26,738	3,520	(15,133)
Costs and estimated earnings in excess of billings on uncompleted contracts	14,852	13,821	3,765
Inventories	4,127	178	5,500
Prepaid expenses and other	(19,105)	(2,687)	3,452
Change in operating lease right of use asset	3,010	3,825	8,167
Deposits and other	(4,154)	(893)	(22,525)
Accounts payable and accrued expenses	(21,936)	(5,373)	8,738
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,931)	8,424	(15,647)
Liabilities for severance pay	(3,055)	(2)	757
Change in operating lease liabilities	(2,816)	(3,765)	(8,405)
Other liabilities, net	(102)	(2,023)	(617)
Net cash provided by operating activities	258,822	265,005	236,493
Cash flows from investing activities:
Purchase of marketable securities	(60,070)	0	0
Maturities of marketable securities	16,272	0	0
Capital expenditures	(419,272)	(320,738)	(279,986)
Cash received from insurance recoveries	0	4,700	35,435
Investment in unconsolidated companies	(6,401)	(20,960)	(10,674)
Cash paid for acquisition of a business, net of cash acquired	(171,000)	(43,397)	0
Decrease (increase) in severance pay fund asset, net of payments made to retired employees	3,189	845	687
Other investing activities	(911)	(6,419)	0
Net cash used in investing activities	(638,193)	(385,969)	(254,538)
Cash flows from financing activities:
Proceeds from long-term loans, net of transaction costs	275,000	419,262	132,847
Proceeds from exercise of options by employees	0	0	2,429
Proceeds from issuance of common stock, net of stock issuance costs	311	339,471	0
Proceeds from the sale of limited liability company interest, net of transaction costs	37,141	0	58,289
Repayments of commercial paper and prepayments of long-term debt	0	(50,000)	(21,073)
Proceeds from issuance of commercial paper	0	0	50,000
Proceeds from revolving credit lines with banks	0	1,249,400	1,450,850
Repayment of revolving credit lines with banks	0	(1,289,950)	(1,569,300)
Cash received from noncontrolling interest	5,390	7,577	3,346
Repayments of long-term debt and financing liability	(93,046)	(135,384)	(72,708)
Cash paid to noncontrolling interest	(6,903)	(9,739)	(9,730)
Payments under finance lease obligations	(3,181)	(2,890)	(3,164)
Deferred debt issuance costs	(1,341)	(1,798)	(5,165)
Cash dividends paid	(26,986)	(22,471)	(22,386)
Net cash provided by (used in) financing activities	186,385	503,478	(5,765)
Effect of exchange rate changes	(348)	1,154	(575)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(193,334)	383,668	(24,385)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	536,778	153,110	177,495
Cash and cash equivalents and restricted cash and cash equivalents at end of period	343,444	536,778	153,110
Supplemental disclosure of cash flow information:
Interest, net of interest capitalized	66,627	60,830	61,628
Income taxes, net	34,357	64,795	1,649
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	7,976	3,148	9,423
Right of use assets obtained in exchange for new lease liabilities	6,175	3,642	11,626
Increase in asset retirement cost and asset retirement obligation	$ 12,153	$ 8,963	$ 8,334