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STOCK-BASED COMPENSATION - Market Condition Restricted Shares - Stock Price Vesting (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 04, 2017
Feb. 26, 2016
item
$ / shares
shares
May 20, 2015
item
shares
Dec. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Stock Price Vesting | Restricted Shares            
Shares            
Outstanding (in shares)       22,000 29,750 69,500
Vested (in shares)         (7,750) (7,750)
Expired (in shares)           (32,000)
Outstanding (in shares)       22,000 22,000 29,750
Weighted Average Fair Value            
Outstanding (in dollars per share) | $ / shares       $ 41.71 $ 39.07 $ 27.03
Vested (in dollars per share) | $ / shares         31.58 34.30
Expired (in dollars per share) | $ / shares           14.08
Outstanding (in dollars per share) | $ / shares       $ 41.71 $ 41.71 $ 39.07
Compensation cost            
Unrecognized compensation cost | $       $ 0    
Stock Price Vesting | Restricted Shares | Mr. Albright            
Stock-based compensation            
Number of increments to vest | item   4 4      
Restricted share award period after termination of employment   60 days 60 days      
Period for average closing price   30 days 30 days      
Stock based compensation, shares, permanently surrendered   68,000        
Shares            
Granted (in shares)     26,000      
Outstanding (in shares)   26,000        
Stock Price Vesting | Restricted Shares | Mr. Albright | 2015 and February 26, 2016 grants            
Stock-based compensation            
Number of increments vested | item       2    
Share-based Compensation Award Stock Price Vesting Price Increment One | Restricted Shares | Mr. Albright            
Stock-based compensation            
Number of increments to vest | item   2        
Number of shares in each vesting increment   2,000        
Share-based Compensation Award Stock Price Vesting Price Increment One | Restricted Shares | Mr. Albright | Minimum            
Stock-based compensation            
Closing share price (in dollars per share) | $ / shares   $ 60        
Share-based Compensation Award Stock Price Vesting Price Increment One | Restricted Shares | Mr. Albright | Maximum            
Stock-based compensation            
Closing share price (in dollars per share) | $ / shares   65        
Share-based Compensation Award Stock Price Vesting Price Increment Two | Restricted Shares | Mr. Albright            
Stock-based compensation            
Closing share price (in dollars per share) | $ / shares   $ 70        
Number of shares in each vesting increment   18,000        
Share-based Compensation Award Stock Price Vesting Price Increment Three | Restricted Shares | Mr. Albright            
Stock-based compensation            
Closing share price (in dollars per share) | $ / shares   $ 75        
Number of shares in each vesting increment   4,000        
Equity Award Agreements | Mr. Albright            
Stock-based compensation            
Term of employment agreement     5 years      
Equity Award Agreements | Stock Price Vesting            
Award agreements            
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation 24 months 24 months