Changes to Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property Plant Equipment Value Per Unit	$ 1,000
Property, Plant and Equipment, Useful Life	1 year
Software and Hardware [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)	$ 10,300,000
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentPeriodIncreaseDecreasePerShare	$ 0.06
Software and Hardware [Member] | Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software and Hardware [Member] | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	4 years