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Property And Equipment (Depreciation And Amortization Related To Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property And Equipment [Abstract]
Amortization of capitalized software	$ 6,180	$ 5,624	$ 6,212
Total depreciation expense charged to income	$ 20,680	$ 20,291	$ 20,945

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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