Goodwill And Intangible Assets (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted Average Amortization Period (in years)	8.0
Gross Asset	$ 297,626	$ 295,723
Accumulated Amortization	144,941	133,087
Net	152,685	162,636	118,731
Intellectual Property Rights [Member]
Weighted Average Amortization Period (in years)	10.5
Gross Asset	120,062	118,805
Accumulated Amortization	60,675	57,514
Net	59,387	61,291
Customer Relationships And Backlog [Member]
Weighted Average Amortization Period (in years)	6.6
Gross Asset	134,811	134,401
Accumulated Amortization	49,094	49,129
Net	85,717	85,272
Drawings [Member]
Weighted Average Amortization Period (in years)	0.7
Gross Asset	10,825	10,825
Accumulated Amortization	10,073	10,699
Net	752	126
Other [Member]
Weighted Average Amortization Period (in years)	4.7
Gross Asset	31,928	31,692
Accumulated Amortization	25,099	15,745
Net	$ 6,829	$ 15,947