Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings (Loss) Per Common Share
Net income (loss)	$ 10,645	$ 12,770	$ (264,521)	$ 40,049
Basic weighted average common shares outstanding	37,842,224	37,136,945	37,729,099	37,064,781
Effect of potentially dilutive stock options and restricted stock awards	1,488,623	1,150,060		1,047,412
Diluted weighted average common shares outstanding	39,330,847	38,287,005	37,729,099	38,112,193
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.28	$ 0.34	$ (7.01)	$ 1.08
Diluted (in dollars per share)	$ 0.27	$ 0.33	$ (7.01)	$ 1.05
Anti-dilutive shares excluded in the computation of diluted earnings per share	481,000	3,000,000	2,000,000	3,000,000