Finance Receivables, net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average remaining life of pools	99 months
Unamortized purchased principal (purchase price) under the cost recovery method	$ 18.1	$ 17.1
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated life time of pool at the time of acquisition (in months)	80 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated life time of pool at the time of acquisition (in months)	120 months