Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Additional Information (Details)

v3.22.0.1
Stock Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
item
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Additional Employee Stock Plans Information        
Income tax expense (benefit) $ 3,897 $ (12,276) $ 13,451  
Performance Share Unit Awards        
Additional Employee Stock Plans Information        
Compensation expenses recognized 2,502 $ 567 $ 1,420  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest $ 1,236      
Performance Share Unit Awards | 2010 Plan        
Additional Employee Stock Plans Information        
Performance period 3 years      
Number of performance shares company expects participants to earn | shares 71,697 15,632 29,829  
Number of performance shares units that will be converted into RSUs | shares 54,391      
Restricted Stock Unit Awards        
Additional Employee Stock Plans Information        
fair value per share of the awards | $ / shares $ 44.48 $ 49.90 $ 36.48  
Accelerated stock based compensation expense $ 2,988 $ 1,191 $ 1,374  
Restricted Stock Unit Awards | 2010 Plan        
Additional Employee Stock Plans Information        
Compensation expenses recognized 3,292 $ 2,263 $ 1,819  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest $ 1,289      
Minimum age of employee, attaining which awards are continued to be vested upon retirement | item 65      
Minimum service period, upon serving which awards are continued to be vested upon retirement 10 years      
Minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement | item 55      
Maximum period following a termination of service in which the share-based award will be settled 2 months 15 days      
Restricted Stock Unit Awards | 2010 Plan | Management        
Additional Employee Stock Plans Information        
Accelerated stock based compensation expense       $ 2,988
Restricted Stock Unit Awards | 2010 Plan | Common Stock        
Additional Employee Stock Plans Information        
Number of shares issued upon exercise of units other than options | shares 1