Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 12, 2016	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss)		10.00%
Capital Expenditures Incurred but Not yet Paid		$ 1,300	$ 1,800
Inventories		149,584	177,840
Inventory allowances		24,200	28,000
Provision for inventory obsolescence allowance		4,100	5,200	$ 5,000
Total restructuring charges, net		8,975	4,634	5,246
Accrual of late shipment penalties		4,800	6,000
Goodwill		206,659	115,452	72,429
Foreign exchange losses		$ 2,100	$ 800	$ (1,100)
Anti-dilutive options and RSUs, shares				129,329
Range of exercise prices, lower range limit		$ 70.42	$ 41.17	$ 64.94
Range of exercise prices, upper range limit		$ 79.33	$ 79.33	$ 79.33
Research and development expenditures		$ 5,900	$ 5,900	$ 7,800
Outstanding		206,685
Stock Price for consecutive trading days (in days)		60 days
Award vesting, percentage		25.00%
Term of forfeiture (in years)		5 years
Downstream [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill					$ 93,228
Energy [Member]
Summary Of Significant Accounting Policies [Line Items]
Total restructuring charges, net		$ 3,185	2,903	1,963
Goodwill		144,405	43,687	48,070
Aerospace [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill		$ 62,254	$ 71,765	$ 24,359
Stock-Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive options and RSUs, shares		36,281
Restricted Stock Units (RSUs) [Member]
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive options and RSUs, shares			297,915
Outstanding		138,761	109,281	115,949		176,084
Inventory Related Charges [Member]
Summary Of Significant Accounting Policies [Line Items]
Total restructuring charges, net		$ 2,800	$ 9,400	$ 8,000
Inventory Related Charges [Member] | Energy [Member]
Summary Of Significant Accounting Policies [Line Items]
Total restructuring charges, net	$ 200
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%
Operating Segments [Member] | Aerospace [Member] | Aerospace [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill		$ 21,500
Operating Segments [Member] | Energy [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill		144,400
Operating Segments [Member] | Process and Industrial [Member] | Aerospace [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill		$ 40,800
Qualified Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Defined Benefit Plan And Other Post-Retirement, Actuarial Gain (Losses), Period Of Recognition		26 years
Nonqualified Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Defined Benefit Plan And Other Post-Retirement, Actuarial Gain (Losses), Period Of Recognition		20 years