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Equity Incentive Plan - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Options            
Options Outstanding, Beginning of Period (in shares)     1,529,300 1,498,000 1,498,000  
Granted (in shares) 0 0 0 0    
Exercised (in shares)     0 2,200    
Forfeited (in shares)     0 12,600    
Expired (in shares)     0 0    
Options Outstanding, End of period (in shares) 1,529,300 1,483,200 1,529,300 1,483,200 1,529,300 1,498,000
Exercisable (in shares) 829,400 546,350 829,400 546,350    
Weighted- average exercise price            
Options Outstanding, Beginning of Period (in usd per share)     $ 14.50 $ 14.41 $ 14.41  
Granted (in usd per share)     0.00 0.00    
Exercised (in usd per share)     0.00 14.37    
Forfeited (in usd per share)     0.00 14.37    
Expired (in usd per share)     0.00 0.00    
Options Outstanding, End of Period (in usd per share) $ 14.50 $ 14.41 14.50 14.41 $ 14.50 $ 14.41
Exercisable (in usd per share) $ 14.40 $ 14.39 $ 14.40 $ 14.39    
Remaining contractual life (years)     6 years 3 months 7 years 2 months 6 years 9 months 18 days 7 years 8 months
Aggregate intrinsic value (in usd) $ 17,433 $ 8,660 $ 17,433 $ 8,660 $ 6,117 $ 3,519