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Significant Accounting Policies and Consolidated Financial Statement Components Loans and Fees Receivable, Net Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]        
Deferred revenue $ 16.8us-gaap_LoansAndLeasesReceivableDeferredIncome $ 13.6us-gaap_LoansAndLeasesReceivableDeferredIncome $ 15.7us-gaap_LoansAndLeasesReceivableDeferredIncome $ 13.3us-gaap_LoansAndLeasesReceivableDeferredIncome
Weighted average remaining accretion period of deferred revenue 11 months 10 months