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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2019 | Aug. 31, 2018
Class of Stock [Line Items] |  |  |  |
Warrants and rights, number of shares allowed to purchase (in shares) |  |  | 420,000 |
Class of warrant or right, number of securities called by each warrant or right (in shares) |  |  |  | 0.192
Common shares issued as earn-out consideration (in shares) | 9,800,000 | 9,800,000 |  |
Common shares issued as earn-out consideration (in shares) | 0 |  |  |
Tranche One |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares issued as earn-out consideration (in shares) | 4,900,000 |  |  |
Earn-out consideration, future minimum EBITDA |  | $ 82.5 |  |
Earn-out consideration, minimum stock price (in dollars per share) | $ 12.00 |  |  |
Tranche Two |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares issued as earn-out consideration (in shares) | 4,900,000 |  |  |
Earn-out consideration, future minimum EBITDA | $ 91.5 |  |  |
Earn-out consideration, minimum stock price (in dollars per share) | $ 14.00 |  |  |
MI Acquisitions Warrants, Public |  |  |  |
Class of Stock [Line Items] |  |  |  |
Class of warrant or right, outstanding (in shares) |  |  |  | 5,310,109
MI Acquisitions Warrants, Private |  |  |  |
Class of Stock [Line Items] |  |  |  |
Warrants and rights, number of shares allowed to purchase (in shares) |  |  |  | 421,107

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