Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Cost of revenues										$ 655,504,000	$ 688,267,000	$ 332,818,000
Provision for income taxes										14,676,000	9,451,000	(7,211,000)
Net Income (Loss) Attributable to Parent	$ 1,556,000	$ (112,337,000)	$ (18,520,000)	$ (4,634,000)	$ (21,004,000)	$ (6,841,000)	$ 5,902,000	$ (17,441,000)		(133,935,000)	(39,384,000)	11,789,000
Revenues	242,638,000	237,052,000	$ 245,768,000	$ 238,855,000	266,716,000	$ 247,209,000	$ 259,658,000	$ 239,887,000		964,313,000	1,013,470,000	505,492,000
Contract with Customer, Asset, after Allowance for Credit Loss	46,912,000				52,781,000					46,912,000	52,781,000
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	30,852,000				19,906,000					30,852,000	19,906,000
Contract with Customer, Liability	(35,007,000)				(41,951,000)					(35,007,000)	(41,951,000)
Capital Expenditures Incurred but Not yet Paid										1,200,000	1,400,000
Inventories	137,309,000				143,682,000					137,309,000	143,682,000
Goodwill	$ 271,893,000				450,605,000				$ 497,162,000	271,893,000	450,605,000	497,162,000
Foreign Currency Translations										(395,000)	$ (1,677,000)	$ 790,000
Anti-dilutive options and RSUs, shares													252,001
Range of exercise prices, lower range limit											$ 33.63	$ 26.06	$ 51.84
Range of exercise prices, upper range limit											$ 71.56	$ 71.56	$ 71.56
Research and development expenditures										$ 7,600,000	$ 8,500,000	$ 5,200,000
Outstanding	(381,561)									(381,561)
Stock Price for consecutive trading days (in days)											60 days
Award vesting, percentage											25.00%
Term of forfeiture (in years)											5 years
Decrease in retained earnings	$ (99,280,000)				(232,102,000)					$ (99,280,000)	$ (232,102,000)
Deferred Tax Liabilities, Net, Noncurrent	(21,425,000)				(33,607,000)					(21,425,000)	(33,607,000)
Accounts Receivable, Sale		34.4
Proceeds from Sale and Collection of Receivables		$ 32.2
Lease, Liability	20,607,000									20,607,000
Total restructuring charges, net									16,910,000	5,186,000	5,848,000	2,559,000
Energy [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenues										240,982,000	288,877,000	183,399,000
Goodwill	0				96,272,000				145,458,000	0	96,272,000	145,458,000
Total restructuring charges, net										(1,181,000)	3,661,000	54,000
Aerospace [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenues										272,625,000	237,017,000	182,983,000
Goodwill	$ 57,385,000				$ 57,418,000				$ 62,548,000	$ 57,385,000	$ 57,418,000	$ 62,548,000
Stock-Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive options and RSUs, shares											431,165
Restricted Stock Units (RSUs) [Member]
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive options and RSUs, shares												1,041,454
Outstanding	(274,959)				(226,683)					(274,959)	(226,683)
Vesting Year 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Award vesting, percentage											50.00%
Vesting Year 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Award vesting, percentage											100.00%
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Leases, Right-of-Use Asset														$ 10,700,000
Lease, Liability														$ 10,900,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					10.00%						10.00%