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Significant Accounting Policies and Consolidated Financial Statement Components Schedule of Allowance for uncollectible loans and fees receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Allowance for uncollectible loans and fees receivable:    
Balance at beginning of period $ (43,300) $ (21,500)
Provision for loan losses (77,600) (53,700)
Charge offs 63,800 37,700
Recoveries (5,900) (5,800)
Balance at end of period (63,000) (43,300)
Loans and fees receivable:    
Balance at end of period individually evaluated for impairment (400) (600)
Balance at end of period collectively evaluated for impairment (62,600) (42,700)
Loans and fees receivable, gross 393,900 290,700
Loans and fees receivable individually evaluated for impairment 600 1,000
Loans and fees receivable collectively evaluated for impairment 393,300 289,700
Credit Card Receivable [Member]    
Allowance for uncollectible loans and fees receivable:    
Balance at beginning of period (1,400) (1,200)
Provision for loan losses (19,200) 700
Charge offs 3,800 1,800
Recoveries (1,400) (2,700)
Balance at end of period (18,200) (1,400)
Loans and fees receivable:    
Balance at end of period individually evaluated for impairment 0 0
Balance at end of period collectively evaluated for impairment (18,200) (1,400)
Loans and fees receivable, gross 87,200 11,000
Loans and fees receivable individually evaluated for impairment 0 0
Loans and fees receivable collectively evaluated for impairment 87,200 11,000
Automobile Loan [Member]    
Allowance for uncollectible loans and fees receivable:    
Balance at beginning of period (2,100) (1,700)
Provision for loan losses (1,900) (2,600)
Charge offs 3,000 3,300
Recoveries (1,300) (1,100)
Balance at end of period (2,300) (2,100)
Loans and fees receivable:    
Balance at end of period individually evaluated for impairment (200) (300)
Balance at end of period collectively evaluated for impairment (2,100) (1,800)
Loans and fees receivable, gross 77,800 77,100
Loans and fees receivable individually evaluated for impairment 400 700
Loans and fees receivable collectively evaluated for impairment 77,400 76,400
Other Unsecured Lending Products [Member]    
Allowance for uncollectible loans and fees receivable:    
Balance at beginning of period (39,800) (18,600)
Provision for loan losses (56,500) (51,800)
Charge offs 57,000 32,600
Recoveries (3,200) (2,000)
Balance at end of period (42,500) (39,800)
Loans and fees receivable:    
Balance at end of period individually evaluated for impairment (200) (300)
Balance at end of period collectively evaluated for impairment (42,300) (39,500)
Loans and fees receivable, gross 228,900 202,600
Loans and fees receivable individually evaluated for impairment 200 300
Loans and fees receivable collectively evaluated for impairment $ 228,700 $ 202,300