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Property and Equipment (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Abstract]      
Depreciation, including amortization related to leasehold improvements $ 0.4 $ 0.4 $ 0.3