Basis of Presentation Useful lives for property, equipment and capitalized software (Details)	12 Months Ended
	Dec. 31, 2011 years
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment, Useful Life, Minimum (years)	3
Property, Plant and Equipment, Useful Life, Maximum (years)	7
Building [Member]
Property, Plant and Equipment, Useful Life, Minimum (years)	35
Property, Plant and Equipment, Useful Life, Maximum (years)	40
Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life, Maximum (years)	7
Capitalized software [Member]
Property, Plant and Equipment, Useful Life, Minimum (years)	3
Property, Plant and Equipment, Useful Life, Maximum (years)	5