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Noncontrolling Interest - Contributions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | 33 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2017
Noncontrolling Interest [Line Items] |  |  |  |  |
Ownership percentage | 100.00% | 72.00% | 92.00% | 83.00% | 100.00%
ASTC Contribution |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Contributions made | $ 3,500 | $ 1,422 | $ 3,000 | $ 1,000 | $ 8,922
Minority Owner |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Contributions made | $ (422) | $ 422 | $ 0 | $ 0 | $ 0

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