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Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Basic and diluted income (loss) per share computation:          
Net income (loss) attributable to common stockholders $ 13,259 $ 11,652 $ 5,203 $ (2,181)  
Weighted average common shares—basic 39,347,244 38,104,909 39,227,708 38,021,807  
Effect of dilutive stock options and restricted stock awards (in shares) 1,338,423 902,367 1,545,309    
Weighted average common shares—diluted 40,685,667 39,007,276 40,773,017 38,021,807  
Basic net income (loss) per share (in dollars per share) $ 0.34 $ 0.31 $ 0.13 $ (0.06)  
Diluted net income (loss) per share $ 0.33 $ 0.30 $ 0.13 $ (0.06)  
Anti-dilutive shares       2,996,186  
Additional disclosures          
Common stock, shares issued 44,898,430   44,898,430   44,325,772
Common stock, shares outstanding 41,395,832   41,395,832   40,823,174
Stock options and restricted stock          
Basic and diluted income (loss) per share computation:          
Anti-dilutive shares 1,433,694 2,039,395 1,145,471