Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015
Statement of Cash Flows [Abstract]
Net earnings	$ 43,727	$ 51,664
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	33,732	27,809
Accretion of convertible notes discount	1,598	1,516
Provision for doubtful accounts	1,021	1,925
Net (gain)/loss on sale of assets	10	(415)
Net loss on derivative instruments	783	423
Stock compensation expense	4,711	5,304
Excess tax benefit from share-based compensation arrangements	(302)	(324)
Deferred income taxes	3,993	(2,001)
Changes in assets and liabilities, excluding effects of acquisitions/divestitures:
Accounts receivable	(12,011)	1,583
Inventories	(10,050)	(10,430)
Income tax refunds receivable	883	(3,493)
Other current assets	1,271	(7,421)
Accounts payable - trade	967	18,051
Accrued contract losses	468	28
Advances on contracts	3,573	11,511
Other accruals and payables	6,556	(5,807)
Income taxes payable	28	529
Pension liabilities	(9,318)	(4,225)
Other long-term liabilities	(1,624)	(2,323)
Net cash provided by operating activities	70,016	83,904
Cash flows from investing activities:
Proceeds from sale of assets	190	660
Expenditures for property, plant & equipment	(23,926)	(23,130)
Acquisition of businesses (net of cash acquired)	(6,631)	(11,877)
Other, net	(442)	(696)
Cash used in investing activities	(30,809)	(35,043)
Cash flows from financing activities:
Net borrowings (repayments) under revolving credit agreements	(12,959)	(43,291)
Proceeds from issuance of long-term debt	0	100,000
Debt repayment	(3,750)	(82,500)
Net change in book overdraft	3,427	(3,537)
Proceeds from exercise of employee stock awards	7,094	4,024
Purchase of treasury shares	(8,989)	(8,642)
Dividends paid	(14,625)	(14,140)
Debt issuance costs	0	(1,348)
Other	(246)	(117)
Windfall tax benefit	302	324
Cash provided by (used in) financing activities	(29,746)	(49,227)
Net increase in cash and cash equivalents	9,461	(366)
Effect of exchange rate changes on cash and cash equivalents	(372)	(466)
Cash and cash equivalents at beginning of period	16,462	$ 12,411
Cash and cash equivalents at end of period	$ 25,551