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Properties And Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Properties And Equipment [Abstract]
Net book value of computer software	$ 14.1	$ 15.4
Depreciation expense for computer software	$ 4.3	$ 5.6	$ 5.9

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

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.