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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 27, 2019
Aug. 31, 2018
Jun. 30, 2018
Feb. 28, 2018
May 16, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock authorized (shares) 75,000,000 75,000,000            
Common stock par value (usd per share) $ 0.0001 $ 0.0001            
Preferred stock authorized (shares) 25,000,000 25,000,000            
Preferred stock par value (usd per share) $ 0.0001 $ 0.0001            
Stock options outstanding (shares) 0 0            
Common stock outstanding (shares) 19,389,066 20,135,514            
Preferred stock outstanding (shares) 0 0            
Dividends declared (usd per share) $ 0.50 $ 0.50 $ 0.75          
Common stock repurchase program, authorized amount         $ 10,000   $ 10,000  
Issuance of common stock under the Employee Stock Purchase Plan $ 247 $ 256            
2012 Equity Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity securities granted (shares)               2,194,986
2012 Equity Plan | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 1 year              
2012 Equity Plan | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2012 Equity Plan | Contingent restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2011 Long Term Incentive Plan | Restricted Stock and RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested shares outstanding (shares) 404,325 393,084            
Compensation cost not yet recognized $ 3,500              
Compensation cost not yet recognized, period for recognition 1 year 7 months 6 days              
2011 Long Term Incentive Plan | Contingent restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested shares outstanding (shares) 254,641              
ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity securities granted (shares)           250,000    
Award required holding period 2 years              
Issuance of common stock under the Employee Stock Purchase Plan (shares) 20,120 17,760            
Issuance of common stock under the Employee Stock Purchase Plan $ 200 $ 300            
Maximum | ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Offering period 6 months              
Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividend rate (usd per share)       $ 0.125        
Dividends declared       $ 2,400        
Tranche one | 2012 Equity Plan | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percent 33.33%              
Tranche two | 2012 Equity Plan | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percent 33.33%              
Tranche three | 2012 Equity Plan | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percent 33.33%