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Acquisition - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | Jul. 06, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 27, 2017 | Jun. 30, 2016
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 32,230 | $ 12,692 |  | $ 12,470
Dealer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible asset, useful life | 20 years |  |  |  |
Patent |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible asset, useful life | 15 years |  |  |  |
Cobalt |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of total consideration transferred | $ 130,525 |  |  |  |
Cash consideration paid | 129,525 |  |  |  |
Equity consideration paid | $ 1,000 |  |  |  |
Weighted average useful life | 19 years 9 months |  |  |  |
Goodwill | $ 19,791 |  |  |  |
Acquisition related costs |  | $ 489 | $ 3,056 |  |
Cobalt | Class A Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Issuance of common stock (in shares) | 39,262 |  |  |  |
Stock price (in dollars per share) |  |  |  | $ 25.47 |

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