Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Basic EPS:
Net income	$ 10,916	$ (2,959)	$ 3,286	$ 5,914	$ 7,556	$ 11,396	$ 10,306	$ 6,552	$ 17,157	$ 35,810	$ 24,008
Weighted average shares outstanding									26,603	26,288	25,962
Basic EPS (in dollars per share)	$ 0.41	$ (0.11)	$ 0.12	$ 0.22	$ 0.29	$ 0.43	$ 0.39	$ 0.25	$ 0.64	$ 1.36	$ 0.92
Diluted EPS:
Weighted average shares outstanding									26,603	26,288	25,962
Dilutive stock options									110	180	81
Dilutive nonvested deferred shares									464	508	315
Diluted weighted average shares									27,177	26,976	26,358
Diluted EPS (in dollars per share)	$ 0.40	$ (0.11)	$ 0.12	$ 0.22	$ 0.28	$ 0.42	$ 0.38	$ 0.25	$ 0.63	$ 1.33	$ 0.91