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STOCK-BASED COMPENSATION (Restricted Stock Units and Performance Share Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Share-Based Awards - Shares      
Unvested, beginning of period (in shares) 286,579 320,735 320,547
Granted (in shares) 61,912 49,721 73,893
Vested (in shares) (118,668) (134,549) (76,730)
Performance Shares Adjustment (in shares) (683) 66,245 19,357
Forfeited (in shares) (13,057) (15,573) (16,332)
Unvested, end of period (in shares) 216,083 286,579 320,735
Share-Based Awards - Weighted Average Grant Date Fair Value      
Unvested at (in dollars per share) $ 1,659 $ 1,386 $ 1,288
Granted (in dollars per share) 1,716 2,034 1,735
Vested (in dollars per share) 1,346 1,250 1,328
Performance Shares Adjustment (in dollars per share) 1,729 1,872 1,501
Forfeited (in dollars per share) 1,769 1,685 1,395
Unvested at (in dollars per share) $ 1,835 $ 1,659 $ 1,386
Restricted Stock Units (RSUs)      
Share-Based Awards - Shares      
Unvested, beginning of period (in shares) 224,983 203,961 195,059
Granted (in shares) 157,205 116,583 100,614
Vested (in shares) (95,484) (69,693) (67,041)
Forfeited (in shares) (29,959) (25,868) (24,671)
Unvested, end of period (in shares) 256,745 224,983 203,961
Share-Based Awards - Weighted Average Grant Date Fair Value      
Unvested at (in dollars per share) $ 1,783 $ 1,503 $ 1,300
Granted (in dollars per share) 1,739 2,025 1,745
Vested (in dollars per share) 1,653 1,389 1,302
Forfeited (in dollars per share) 1,812 1,731 1,430
Unvested at (in dollars per share) $ 1,801 $ 1,783 $ 1,503
Minimum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 1 year    
Maximum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Performance Share Units 2019 Grants | Shares probable to be issued | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 60,588    
Performance Share Units 2019 Grants | Shares not subject to achieve minimum performance threshold | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 47,170    
Performance Share Units 2019 Grants | Maximum number of shares that could be issued | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 121,176    
Performance Share Units 2018 Grants | Shares probable to be issued | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 76,560    
Performance Share Units 2018 Grants | Shares not subject to achieve minimum performance threshold | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 29,753    
Performance Share Units 2018 Grants | Maximum number of shares that could be issued | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 82,126    
Performance Share Units 2017 Grants | Shares probable to be issued | Performance Shares      
Share-Based Awards - Shares      
Unvested, end of period (in shares) 78,935