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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Accounting Policies [Abstract]        
Net income (in dollars) $ 18,577 $ 16,696 $ 67,508 $ 49,876
Weighted average number of shares - basic 39,356 38,998 39,203 38,951
Dilutive effect of stock options and warrant 644 921 793 815
Weighted average number of shares - diluted 40,000 39,919 39,996 39,766
Net income per share:        
basic (in dollars per share) $ 0.47 $ 0.43 $ 1.72 $ 1.28
diluted (in dollars per share) $ 0.46 $ 0.42 $ 1.69 $ 1.25