Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	14.4
Gross Asset	$ 299,889	$ 295,723
Accumulated Amortization	153,662	133,087
Net	146,227	162,636	118,731
Intellectual Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17.7
Gross Asset	89,619	88,797
Accumulated Amortization	46,286	43,866
Net	43,333	44,931
Customer Relationships And Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11.7
Gross Asset	146,291	144,085
Accumulated Amortization	66,256	54,152
Net	80,035	89,933
Drawings [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	9.5
Gross Asset	11,824	11,824
Accumulated Amortization	10,423	9,994
Net	1,401	1,830
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	15.5
Gross Asset	52,155	51,017
Accumulated Amortization	30,697	25,075
Net	$ 21,458	$ 25,942