Fair Value Measurements (Details) (contingent cosideration [Member])	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
contingent cosideration [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs Discount Rate	30.00%	27.00%