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Stock-Based Compensation - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Option Shares      
Outstanding at beginning of period (in shares) 50,985    
Granted (in shares) 0 0 0
Exercised (in shares) (35,310) (4,950) (5,784)
Forfeited (in shares) 0    
Expired (in shares) (2,475)    
Outstanding at end of period (in shares) 13,200 50,985  
Exercisable at end of period (in shares) 13,200    
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 24.09    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 24.37    
Forfeited (in dollars per share) 0.00    
Expired (in dollars per share) 31.31    
Outstanding at end of period (in dollars per share) 21.97 $ 24.09  
Exercisable at end of period (in dollars per share) $ 21.97    
Weighted Average Remaining Contractual Term      
Outstanding at end of period 19 days    
Exercisable at end of period 19 days    
Aggregate Intrinsic Value      
Outstanding at end of period $ 97    
Exercisable at end of period $ 97