Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Statement of Cash Flows [Abstract]
Net earnings	$ 14,125	$ 14,066
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	10,014	10,661
Amortization of debt issuance costs	461	449
Accretion of convertible notes discount	669	637
Provision for doubtful accounts	44	295
Net gain on sale of assets	(61)	(63)
Net loss (gain) on derivative instruments	247	(391)
Stock compensation expense	1,880	1,455
Deferred income taxes	1,150	2,232
Changes in assets and liabilities, excluding effects of acquisitions/divestitures:
Accounts receivable	40,518	(6,014)
Contract assets	(12,635)	(25,130)
Contract costs	1,015	(4,990)
Inventories	(19,475)	(1,947)
Income tax refunds receivable	(394)	2,893
Operating Right-of-Use Assets	3,603	0
Other assets	(4,160)	(5,615)
Accounts payable - trade	(9,594)	10,187
Contract liabilities	(1,063)	75,986
Operating Lease Liabilities	(3,458)	0
Other current liabilities	(6,980)	(8,209)
Income taxes payable	1,783	(1,817)
Pension liabilities	1,043	(11,938)
Other long-term liabilities	3,904	4,166
Net cash provided by operating activities	22,636	56,913
Cash flows from investing activities:
Proceeds from sale of assets	65	103
Expenditures for property, plant & equipment	(7,425)	(6,422)
Other, net	(732)	(293)
Net cash used in investing activities	(8,092)	(6,612)
Cash flows from financing activities:
Net repayments under revolving credit agreements	(8,500)	(50,708)
Debt repayment	(1,875)	(1,875)
Net change in bank overdraft	4,058	2,598
Proceeds from exercise of employee stock awards	1,519	2,687
Purchase of treasury shares	(2,951)	(4,600)
Dividends paid	(5,578)	(5,569)
Other	(382)	(271)
Net cash used in financing activities	(13,709)	(57,738)
Net increase (decrease) in cash and cash equivalents	835	(7,437)
Effect of exchange rate changes on cash and cash equivalents	(190)	583
Cash and cash equivalents at beginning of period	27,711
Cash and cash equivalents at end of period	28,356	30,050
Supplemental disclosure of noncash activities:
Value of common shares issued for unwind of warrant transactions	$ 0	$ 2,281