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Property and Equipment	6 Months Ended
Property and Equipment	Jun. 30, 2011
Property and Equipment [Abstract]
Property and Equipment	8. Property and Equipment. The Company has capitalized costs related to its various technology initiatives. The net book value of the property and equipment related to software development was $8.1 million as of June 30, 2011 and $7.9 million as of December 31, 2010, which includes work-in-progress of $4.2 million and $3.0 million, respectively.