Segment Information (Reportable Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Restructuring Costs and Asset Impairment Charges	$ 10,590	$ 13,525
Net revenues	192,213	238,855
Operating Income (Loss)	(73,405)	17,750
Other Operating Income	11,075	23,433
Special Charges, Net	(45,175)	(8,200)
Special Other Charges		1,450
Total special charges, net	(45,175)	(8,200)
Restructuring Charges	2,883	358
Asset Impairment Charges	116,182	0
Interest expense	9,011	13,094
Other income, net	(2,680)	(2,148)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(79,736)	6,804
Identifiable assets	1,309,077	1,719,334	$ 1,470,945
Capital expenditures	3,412	3,292
Depreciation, Depletion and Amortization	15,637	18,036
Corporate Identifiable Assets After Elimination Of Intercompany Assets [Member]
Segment Reporting Information [Line Items]
Identifiable assets	87,700	27,800
Aerospace & Defense [Member]
Segment Reporting Information [Line Items]
Net revenues	65,493	61,240
Total special charges, net	0
Aerospace [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	12,494	9,374
Identifiable assets	463,744	406,064
Capital expenditures	640	788
Depreciation, Depletion and Amortization	3,093	2,673
Corporate/Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(6,588)	(8,522)
Capital expenditures	198	387
Industrial Segment
Segment Reporting Information [Line Items]
Net revenues	126,720	177,615
Operating Income (Loss)	5,169	22,581
Total special charges, net	(53,101)	(8,679)
Restructuring Charges	2,690	290
Identifiable assets	1,650,963	2,288,645
Capital expenditures	2,225	1,676
Depreciation, Depletion and Amortization	12,419	15,199
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total special charges, net	7,926	479
Restructuring Charges	183	0
Identifiable assets	(805,630)	(975,375)
Depreciation, Depletion and Amortization	125	164
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Special Restructuring Charges		358
Special Other Charges		(8,200)
Total special charges, net	(42,292)	(7,842)
Restructuring Charges	(602)	325
Special Acquisition Amortization	10,218	12,077
Restatement Impact	974	1,123
Restatement Adjustment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	3,063	$ 2,851
Interest Rate Swap [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 6,000