Equity - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Numerator for basic and diluted earnings per share attributable to common stockholders:
Net income attributable to common stockholders	$ 6,351	$ 15,770
Denominator:
Basic (in shares)	14,022,438	13,898,626
Effect of diluted securities (in shares)	200,000,000	0
Diluted (in shares)	14,222,438	13,898,626
Basic earnings (in dollars per share)	$ 0.45	$ 1.13
Diluted earnings (in dollars per share)	$ 0.45	$ 1.13