Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018
Statement of Cash Flows [Abstract]
Net earnings	$ 27,591	$ 29,160
Earnings from discontinued operations, net of tax	15,380	19,412
Earnings from continuing operations	12,211	9,748
Adjustments to reconcile net earnings from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation and amortization	12,365	14,191
Amortization of debt issuance costs	906	899
Accretion of convertible notes discount	1,347	1,282
Provision for doubtful accounts	204	227
Net gain on sale of assets	(65)	(1,589)
Net loss on derivative instruments	3	467
Stock compensation expense	3,557	3,303
Deferred income taxes	(3,252)	7,297
Changes in assets and liabilities, excluding effects of acquisitions/divestitures:
Accounts receivable	48,270	47,180
Contract assets	(19,572)	(38,442)
Contract costs	2,355	(5,480)
Inventories	(31,662)	1,590
Income tax refunds receivable	(3,656)	(803)
Operating Right-of-Use Assets	2,140	0
Other assets	(892)	(2,977)
Accounts payable - trade	(2,673)	(836)
Contract liabilities	(4,640)	75,261
Operating Lease Liabilities	(2,115)	0
Other current liabilities	(4,606)	(4,284)
Income taxes payable	(147)	(2,527)
Pension liabilities	2,087	(23,887)
Other long-term liabilities	(1,303)	(905)
Net Cash Provided by Operating Activities of Continuing Operations	10,862	79,715
Net Cash (Used in) Provided by Operating Activities of Discontinued Operations	(9,134)	14,027
Net cash provided by operating activities	1,728	93,742
Cash flows from investing activities:
Proceeds from sale of assets	71	1,692
Expenditures for property, plant & equipment	(11,375)	(10,831)
Other, net	(1,618)	(687)
Net Cash Used in Investing Activities of Continuing Operations	(12,922)	(9,826)
Net Cash Used in Investing Activities of Discontinued Operations	(3,662)	(4,909)
Net cash used in investing activities	(16,584)	(14,735)
Cash flows from financing activities:
Net borrowings (repayments) under revolving credit agreements	16,700	(71,383)
Debt repayment	(4,375)	(3,750)
Net change in bank overdraft	724	878
Proceeds from exercise of employee stock awards	3,546	5,274
Purchase of treasury shares	(3,063)	(8,824)
Dividends paid	(11,160)	(11,149)
Other, net	(663)	(439)
Net Cash Provided by Financing Activities of Continuing Operations	1,709	(89,393)
Net Cash (Used in) Provided by Financing Activities of Discontinued Operations	4,458	1,700
Net cash provided by (used in) financing activities	6,167	(87,693)
Net decrease in cash and cash equivalents	(8,689)	(8,686)
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	(1,957)	(2,023)
Effect of exchange rate changes on cash and cash equivalents	(49)	(578)
Cash and cash equivalents at end of period	17,016	25,617
Supplemental disclosure of noncash activities:
Value of common shares issued for unwind of warrant transactions	$ 0	$ 7,583