Significant Accounting Policies and Consolidated Financial Statement Components Schedule of Aging of delinquent loans and fees receivable, gross (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold period past due for Non-Accrual of Finance Receivable			90 days
Delinquent loans and fees receivable, gross	$ 47,100		$ 53,600
Current loans and fees receivable, gross	353,600		340,300
Loans and fees receivable, gross	400,700		393,900
Balance of loans 90 or more days past due and still accruing interest and fees	$ 1,100		1,600
Effective Income Tax Rate Reconciliation, Percent	3.10%	45.90%
(Loss) income before income taxes	$ (4,575)	$ 1,345
Unrecognized Tax Benefits, Income Tax Penalties Expense		$ 200
Income tax settlement amount with taxing authority	7,400
Income Tax Examination, Interest Accrued	$ 4,300
Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold Period Past Due for Write-off of Financing Receivable	180 days
Delinquent loans and fees receivable, gross	$ 12,400		11,400
Current loans and fees receivable, gross	85,400		75,800
Loans and fees receivable, gross	97,800		87,200
Balance of loans 90 or more days past due and still accruing interest and fees	0		0
Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	7,000		10,400
Current loans and fees receivable, gross	71,400		67,400
Loans and fees receivable, gross	78,400		77,800
Balance of loans 90 or more days past due and still accruing interest and fees	1,100		1,600
Other Unsecured Lending Products [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	27,700		31,800
Current loans and fees receivable, gross	196,800		197,100
Loans and fees receivable, gross	224,500		228,900
Balance of loans 90 or more days past due and still accruing interest and fees	0		0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	14,200		18,600
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	2,800		3,200
Financing Receivables, 30 to 59 Days Past Due [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	4,300		6,400
Financing Receivables, 30 to 59 Days Past Due [Member] | Other Unsecured Lending Products [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	7,100		9,000
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	10,000		12,500
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	2,700		3,300
Financing Receivables, 60 to 89 Days Past Due [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	1,400		2,100
Financing Receivables, 60 to 89 Days Past Due [Member] | Other Unsecured Lending Products [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	5,900		7,100
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	22,900		22,500
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	6,900		4,900
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	1,300		1,900
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other Unsecured Lending Products [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Delinquent loans and fees receivable, gross	$ 14,700		$ 15,700