CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net earnings	$ 59,469	$ 51,761
Adjustments to reconcile net earnings to net cash used for operating activities
Depreciation and amortization	28,595	28,142
Gain on sale/disposal of long-lived assets	(349)	(387)
Deferred income taxes	3,629	2,809
Share-based compensation	3,327	3,340
Inventory Write-down	0	1,205
Change in operating assets and liabilities, net of businesses acquired and divested:
Accounts receivable, net	(27,593)	(1,614)
Inventories, net	(18,059)	(24,099)
Progress payments	(1,114)	(1,906)
Accounts payable and accrued expenses	(71,528)	(98,179)
Deferred revenue	(14,836)	(23,298)
Income taxes payable	16,247	22,783
Net pension and postretirement liabilities	1,182	(149,468)
Other current and long-term assets and liabilities	(5,573)	(3,665)
Net cash used for operating activities	(26,603)	(192,576)
Cash flows from investing activities:
Proceeds from sale/disposal of long-lived assets	1,022	2,006
Additions to property, plant, and equipment	(8,537)	(18,637)
Acquisition of business, net of cash acquired	0	51,043
Additional consideration paid on prior year acquisitions	5,340	0
Net cash used for investing activities	(12,855)	(67,674)
Cash flows from financing activities:
Borrowings under revolving credit facility	65,301	188,724
Payment of revolving credit facility	65,301	42,297
Repurchases of common stock	(11,797)	(112,013)
Proceeds from share-based compensation	4,919	5,066
Proceeds from (Payments for) Other Financing Activities	(229)	(212)
Net cash provided by (used for) financing activities	(7,107)	39,268
Effect of exchange-rate changes on cash	(4,614)	(12,294)
Net decrease in cash and cash equivalents	(51,179)	(233,276)
Cash and cash equivalents at beginning of period	198,248	391,033
Cash and cash equivalents at end of period	$ 147,069	$ 157,757