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Goodwill And Related Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Goodwill And Related Intangible Assets [Abstract]
Accumulated impairment losses	$ 129,925,000		$ 129,925,000
Acquired intangible asset amortization expense	$ 1,719,000	$ 1,631,000

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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