Noncontrolling Interest - Contributions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	15 Months Ended	27 Months Ended
	Mar. 31, 2015	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2017
Noncontrolling Interest [Line Items]
Ownership percentage	72.00%	94.00%	92.00%	94.00%
ASTC Contribution
Noncontrolling Interest [Line Items]
Contributions made	$ 1,422	$ 1,000	$ 4,000	$ 6,422
Minority Owner Contribution
Noncontrolling Interest [Line Items]
Contributions made	$ 422	$ 0	$ 0	$ 422