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Goodwill And Other Intangible Assets (Narratives) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill And Other Intangible Assets [Abstract]
Amortization expense of intangible assets	$ 19,590,000	$ 17,205,000	$ 13,900,000
Earnouts	800,000	1,000,000
Adjustments related to foreign acquisition	$ 4,700,000	$ 9,200,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

The change during the reporting period in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment during the period, goodwill written off related to the sale of a business or other adjustments to goodwill.

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