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Stock Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2016
Mar. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award                
Noncash payments for repurchase of common stock     $ 100     $ 23 $ 2,600 $ 4,400
Stock Incentive Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period             3 years  
Expiration period             10 years  
Stock Incentive Plan | Restricted Stock Units (RSUs) | May 2016 Award One                
Share-based Compensation Arrangement by Share-based Payment Award                
Grants in period (in shares) 39,971              
Weighted average grant date fair value (in dollars per share) $ 40.73              
Stock Incentive Plan | Restricted Stock Units (RSUs) | May 2016 Award Two                
Share-based Compensation Arrangement by Share-based Payment Award                
Grants in period (in shares) 2,869              
Weighted average grant date fair value (in dollars per share) $ 47.04              
Stock Incentive Plan | Restricted Stock Units (RSUs) | 3 year vesting period                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period 3 years              
Grants in period (in shares)   154,633            
Weighted average grant date fair value (in dollars per share)   $ 26.77            
Stock Incentive Plan | Performance share awards | 3 year vesting period                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period       3 years 3 years      
Grants in period (in shares)       30,825 136,191      
Weighted average grant date fair value (in dollars per share)       $ 36.83 $ 22.74