Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Basic EPS:
Net income	$ 9,134	$ 4,357	$ 5,431	$ 9,941	$ 10,916	$ (2,959)	$ 3,286	$ 5,914	$ 28,863	$ 17,157	$ 35,810
Weighted average shares outstanding									26,597	26,603	26,288
Basic EPS (in dollars per share)	$ 0.35	$ 0.16	$ 0.20	$ 0.38	$ 0.41	$ (0.11)	$ 0.12	$ 0.22	$ 1.09	$ 0.64	$ 1.36
Diluted EPS:
Weighted average shares outstanding									26,597	26,603	26,288
Dilutive stock options									68	110	180
Dilutive nonvested deferred shares									435	464	508
Diluted weighted average shares									27,100	27,177	26,976
Diluted EPS (in dollars per share)	$ 0.34	$ 0.16	$ 0.20	$ 0.37	$ 0.40	$ (0.11)	$ 0.12	$ 0.22	$ 1.07	$ 0.63	$ 1.33