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Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 33 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of average closing price to be paid by employees     85.00%      
Maximum common stock purchases through advance payroll deductions in a calendar year     $ 25,000      
Share-based compensation $ 823,000 $ 648,000 $ 1,884,000 $ 1,883,000    
Options granted (in shares)       0  
Forfeiture rate     2.80%      
Income tax benefit from adoption of ASU 2016-09 9,000   $ 846,000      
Unrecognized compensation expense related to stock options $ 0   0   $ 0  
Aggregate intrinsic value of stock options exercised     1,675,000 245,000    
Cash receipts of stock options exercised     $ 2,323,000 $ 309,000    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option term     10 years      
Stock options vesting percentage     100.00%      
Stock Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested period     6 months      
Stock Options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested period     2 years      
RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested period     3 years      
Outstanding DSUs (in shares) 367,089   367,089   367,089 328,347
Unrecognized compensation expense related to RSAs $ 6,810,000   $ 6,810,000   $ 6,810,000  
Unrecognized compensation expense expected recognition period     1 year 7 months 28 days      
DSUs | Non-employee Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Outstanding DSUs (in shares) 0   0   0  
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to stock options $ 0   $ 0   $ 0  
Grant date fair value of ESPP options $ 23,000