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Non-controlling interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common unit, outstanding (in shares) | 21,598,534.000 |  |  |  | 19,198,314.000 |  |  |  | 21,598,534.000 | 19,198,314.000 |
Ownership percentage | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |
Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 4,941 |  |  |  | $ 4,679 | $ 4,941 | $ 4,679 |
Allocation of income to non-controlling LLC Unit holders for period | $ 904 | $ 1,124 | $ 799 | $ 529 | $ 602 | $ 833 | $ 836 | $ 446 | 3,356 | 2,717 | $ 2,253
Distributions paid and payable to non-controlling LLC Unit holders for period |  |  |  |  |  |  |  |  | (1,852) | (1,535) |
Reallocation of non-controlling interest |  |  |  |  |  |  |  |  | (943) | (920) |
Ending balance | $ 5,502 |  |  |  | $ 4,941 |  |  |  | $ 5,502 | 4,941 | 4,679
Common units, canceled (in shares) |  |  |  |  |  |  |  |  | 14,821 |  |
Tax distributions payable to non-controlling LLC Unit holders |  |  |  |  |  |  |  |  | $ 511 | $ 309 | 341
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued during period (in shares) |  |  |  |  |  |  |  |  | 2,632,482 |  |
Non-controlling Interest in LLC |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common unit, outstanding (in shares) | 1,043,186 |  |  |  | 1,260,627 |  |  |  | 1,043,186 | 1,260,627 |
Ownership percentage | 4.80% |  |  |  | 6.60% |  |  |  | 4.80% | 6.60% |
Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Tax distributions payable to non-controlling LLC Unit holders |  |  |  |  |  |  |  |  | $ 511 | $ 309 |
Distribution paid to noncontrolling interests |  |  |  |  |  |  |  |  | $ 1,647 | $ 1,226 | $ 1,239
Parent |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common unit, outstanding (in shares) | 20,555,348 |  |  |  | 17,937,687 |  |  |  | 20,555,348 | 17,937,687 |
Ownership percentage | 95.20% |  |  |  | 93.40% |  |  |  | 95.20% | 93.40% |

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