Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 140,016	$ 108,110
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,565	30,833
Income of investees, net of dividends	(927)	(6,314)
Recognition of losses for pension and postretirement plans	1,553	1,295
Stock-based compensation expense	7,477	6,352
Other, net	2,025	(977)
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(2,433)	6,836
Accounts payable	(6,641)	11,191
Retainages	(76)	(2,602)
Contracts in progress and advance billings on contracts	(27,560)	(69,549)
Income taxes	39,098	(6,184)
Accrued and other current liabilities	2,612	(15,192)
Pension liabilities, accrued postretirement benefit obligations and employee benefits	(32,996)	(22,983)
Other, net	2,917	6,250
NET CASH PROVIDED BY OPERATING ACTIVITIES	155,630	47,066
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(115,477)	(75,701)
Acquisition of business	(16,174)	0
Purchases of securities	(2,159)	(2,038)
Sales and maturities of securities	4,305	2,054
Investments, net of return of capital, in equity method investees	88	0
Other, net	0	17
NET CASH USED IN INVESTING ACTIVITIES	(129,417)	(75,668)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	643,000	483,400
Repayments of long-term debt	(628,176)	(390,714)
Payment of debt issuance costs	(6,310)	0
Repurchases of common shares	(20,000)	(20,000)
Dividends paid to common shareholders	(36,764)	(32,976)
Exercises of stock options	1,790	1,400
Cash paid for shares withheld to satisfy employee taxes	(5,044)	(8,654)
Other, net	1,137	815
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(50,367)	33,271
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(690)	447
TOTAL (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS	(24,844)	5,116
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	92,400	36,408
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT END OF PERIOD	67,556	41,524
Cash paid during the period for:
Interest	17,923	19,827
Income taxes (net of refunds)	3,274	38,103
SCHEDULE OF NON-CASH INVESTING ACTIVITY:
Accrued capital expenditures included in accounts payable	$ 17,235	$ 11,204