Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands			1 Months Ended						6 Months Ended
	Jun. 30, 2017	Feb. 01, 2017	Jun. 30, 2018	Feb. 28, 2018	Jan. 31, 2018	Jun. 30, 2017	May 31, 2017	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	May 01, 2017
Business Acquisition [Line Items]
Cash consideration net of cash acquired									$ 153,415	$ 67,876
Goodwill	$ 122,275		$ 151,831			$ 122,275			$ 151,831	$ 122,275	$ 124,183
STLA
Business Acquisition [Line Items]
Percentage of interests acquired			100.00%						100.00%
Cash consideration			$ 14,845
Identifiable intangible assets			7,000						$ 7,000
Net tangible assets			2,280						2,280
Total fair value of net assets acquired			9,280						9,280
Goodwill			$ 5,565						$ 5,565
Hehr
Business Acquisition [Line Items]
Cash consideration				$ 50,125
Identifiable intangible assets				25,500
Net tangible assets				17,355
Total fair value of net assets acquired				42,855
Goodwill				$ 7,270
Metallarte S.r.l.
Business Acquisition [Line Items]
Percentage of interests acquired	100.00%					100.00%				100.00%
Cash consideration						$ 14,100
Cash consideration net of cash acquired	$ 13,501
Contingent consideration	2,366
Total fair value of consideration given	15,867
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Other Liabilities	(327)					(327)				$ (327)
Total fair value of net assets acquired	8,926					8,926				8,926
Goodwill	6,941					6,941				6,941
Taylor Made
Business Acquisition [Line Items]
Percentage of interests acquired					100.00%
Cash consideration					$ 88,445
Net tangible assets					42,133
Total fair value of net assets acquired					74,133
Goodwill					14,312
Lexington
Business Acquisition [Line Items]
Cash consideration							$ 40,062
Total fair value of consideration given							$ 40,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Other Liabilities												$ 4,928
Total fair value of net assets acquired												23,648
Goodwill												16,414
SessaKlein S.p.A.
Business Acquisition [Line Items]
Percentage of interests acquired								100.00%
Cash consideration net of cash acquired		$ 6,502
Contingent consideration		3,838
Total fair value of consideration given		$ 10,340						$ 6,500
Identifiable intangible assets								2,286
Net tangible assets								364
Total fair value of net assets acquired								2,650
Goodwill								$ 7,690
Customer Relationships | Metallarte S.r.l.
Business Acquisition [Line Items]
Identifiable intangible assets	7,311					7,311				7,311
Customer Relationships | Taylor Made
Business Acquisition [Line Items]
Identifiable intangible assets					25,000
Customer Relationships | Lexington
Business Acquisition [Line Items]
Identifiable intangible assets												16,900
Other Intangible Assets | Metallarte S.r.l.
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,942					$ 1,942				$ 1,942
Other Intangible Assets | Taylor Made
Business Acquisition [Line Items]
Identifiable intangible assets					$ 7,000
Other Intangible Assets | Lexington
Business Acquisition [Line Items]
Identifiable intangible assets												$ 1,820