Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

Goodwill And Other Intangible Asset Data (Narrative) (Details) (USD $)	12 Months Ended		12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2011 Patents And Other Intellectual Property [Member]	Dec. 31, 2010 Patents And Other Intellectual Property [Member]	Apr. 02, 2011 Continuing Operations [Member]	Apr. 02, 2011 Discontinued Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 79,703,000	$ 79,703,000			$ 9,114,000	$ 72,795,000
Acquired intangible assets			$ 6,232,000	$ 3,497,000
Intangible assets, estimated useful life, minimum	2
Intangible assets, estimated useful life, maximum	9