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Noncontrolling Interest - Contributions (Details) - USD ($) $ in Thousands |  | 12 Months Ended | 21 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Jun. 30, 2016 | Dec. 31, 2016
Noncontrolling Interest [Line Items] |  |  |
Ownership percentage | 72.00% | 92.00% |
ASTC Contribution |  |  |
Noncontrolling Interest [Line Items] |  |  |
Contributions made | $ 1,422 | $ 4,000 | $ 5,422
Minority Owner Contribution |  |  |
Noncontrolling Interest [Line Items] |  |  |
Contributions made | $ 422 | $ 0 | $ 422

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