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Segment And Related Information (Reconciliation Of Revenue from Segments To Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment And Related Information [Abstract]
Total segment operating income									$ 50,973	$ 46,458	$ 48,900
Amortization of acquired software									(1,125)	(1,592)	(1,411)
Amortization of customer and trade name intangibles									(3,331)	(3,225)	(2,705)
Other expense, net									(2,404)	(1,742)	(146)
Income before income taxes	$ 13,504	$ 11,818	$ 9,309	$ 9,482	$ 10,159	$ 11,263	$ 10,383	$ 8,094	$ 44,113	$ 39,899	$ 44,638

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 amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

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