Goodwill And Intangible Assets (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	14.0
Gross Asset	$ 303,050	$ 299,889
Accumulated Amortization	159,578	153,662
Net	143,472	146,227
Intellectual Property Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17.7
Gross Asset	90,578	89,619
Accumulated Amortization	47,025	46,286
Net	43,553	43,333
Customer Relationships And Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11.7
Gross Asset	148,086	146,291
Accumulated Amortization	69,995	66,256
Net	78,091	80,035
Drawings [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	9.5
Gross Asset	11,824	11,824
Accumulated Amortization	10,617	10,423
Net	1,207	1,401
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	14.0
Gross Asset	52,562	52,155
Accumulated Amortization	31,941	30,697
Net	$ 20,621	$ 21,458