Goodwill And Other Intangible Assets (Schedule Of Amortizable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 90,039	$ 90,039
Accumulated Amortization	(23,475)	(20,670)
Net Book Value	66,564	69,369
Intangible assets, estimated useful life, minimum	4
Intangible assets, estimated useful life, maximum	9
Customer Related Intangibles Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	44,355	44,355
Accumulated Amortization	(9,446)	(8,214)
Net Book Value	34,909	36,141
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	43,446	43,446
Accumulated Amortization	(11,810)	(10,269)
Net Book Value	31,636	33,177
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	248	248
Accumulated Amortization	(248)	(248)
Technology Designs [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	490	490
Accumulated Amortization	(490)	(463)
Net Book Value		27
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	100	100
Accumulated Amortization	(81)	(76)
Net Book Value	19	24
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,400	1,400
Accumulated Amortization	$ (1,400)	$ (1,400)