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Significant Accounting Policies and Consolidated Financial Statement Components Troubled Debt Restructuring (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |
Threshold period past due for Non-Accrual of Finance Receivable | 90 days |
Point-of-Sale [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable Modifications Number Of Contracts Outstanding | 11,432,000 | 7,350,000
Financing Receivable, Modifications, Recorded Investment | $ 17,169 | $ 10,346
Financing Receivable, Carrying Value, Nonaccrual Status | 4,247 | 2,432
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Performing | 2,368 | 1,279
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Nonperforming | $ 1,879 | $ 1,153
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 1,720,000 | 1,645,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 2,675 | $ 1,681
Point-of-Sale [Member] | Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable Modifications Number Of Contracts Outstanding | 915,000 | 560,000
Financing Receivable, Modifications, Recorded Investment | $ 1,570 | $ 865
Direct-to-Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable Modifications Number Of Contracts Outstanding | 6,681,000 | 1,449,000
Financing Receivable, Modifications, Recorded Investment | $ 7,067 | $ 4,728
Financing Receivable, Carrying Value, Nonaccrual Status | 1,173 | 474
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Performing | 508 | 279
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Nonperforming | $ 666 | $ 195
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 870,000 | 381,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 2,466 | $ 1,149
Direct-to-Consumer [Member] | Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable Modifications Number Of Contracts Outstanding | 80,000 | 9,000
Financing Receivable, Modifications, Recorded Investment | $ 86 | $ 10

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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