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Finance Receivables - Activity in allowance for credit losses (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for credit losses | $ 11,165 | $ 7,871 | $ 8,374 | $ 5,426 | $ 8,563 | $ 8,989 | $ 10,146 | $ 9,752 | $ 32,836 | $ 37,450
Finance receivables |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 20,266 |  |  |  | 17,658 | 20,266 | 17,658
Provision for credit losses |  |  |  |  |  |  |  |  | 32,836 | 37,450
Charge-offs |  |  |  |  |  |  |  |  | (38,152) | (36,719)
Recoveries |  |  |  |  |  |  |  |  | 1,982 | 1,877
Balance at end of year | 16,932 |  |  |  | 20,266 |  |  |  | 16,932 | 20,266
Finance receivables | Indirect |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 19,433 |  |  |  | 16,885 | 19,433 | 16,885
Provision for credit losses |  |  |  |  |  |  |  |  | 32,715 | 36,890
Charge-offs |  |  |  |  |  |  |  |  | (37,514) | (36,183)
Recoveries |  |  |  |  |  |  |  |  | 1,941 | 1,841
Balance at end of year | 16,575 |  |  |  | 19,433 |  |  |  | 16,575 | 19,433
Finance receivables | Direct |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 833 |  |  |  | $ 773 | 833 | 773
Provision for credit losses |  |  |  |  |  |  |  |  | 121 | 560
Charge-offs |  |  |  |  |  |  |  |  | (638) | (536)
Recoveries |  |  |  |  |  |  |  |  | 41 | 36
Balance at end of year | $ 357 |  |  |  | $ 833 |  |  |  | $ 357 | $ 833

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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