Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Numerator [Abstract]
Net income (loss)	$ 13,690	$ (40,880)
Denominator [Abstract]
Denominator for basic earnings per share – weighted-average common shares outstanding (shares)	154,118,000	104,709,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2,695,000	0
Dilutive potential common shares [Abstract]
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed exercise of options, restricted shares and warrants (in shares)	156,813,000	104,709,000
Earnings Per Share, Basic [Abstract]
Ne income (loss) per common share - basic (in dollars per share)	$ 0.09	$ (0.39)
Earnings Per Share, Diluted [Abstract]
Net income (loss) per common share - diluted (in dollars per share)			$ 0.09	$ (0.39)
Stock options excluded from the calculation of diluted income (loss) per share (in shares)	1,642