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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Activity) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Number of Shares    
Unvested awards outstanding at January 1, 2019   797,903
Awards granted   282,628
Awards modified   6,897
Awards vested   (273,119)
Awards forfeited/cancelled   (35,004)
Unvested awards outstanding at September 30, 2019 779,305 779,305
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 92.13
Awards granted   170.25
Awards modified   170.74
Awards vested   86.38
Awards forfeited/cancelled   111.93
Unvested awards outstanding at September 30, 2019 $ 122.28 $ 122.28
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Number of Shares    
Unvested awards outstanding at January 1, 2019   793
Awards granted   9,394
Awards modified   0
Awards vested   (396)
Awards forfeited/cancelled   0
Unvested awards outstanding at September 30, 2019 9,791 9,791
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 63.10
Awards granted   167.18
Awards modified   0
Awards vested   63.10
Awards forfeited/cancelled   0
Unvested awards outstanding at September 30, 2019 $ 162.96 $ 162.96
Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units    
Number of Shares    
Unvested awards outstanding at January 1, 2019   302,967
Awards granted   55,912
Awards modified   668
Awards vested   (110,012)
Awards forfeited/cancelled   (4,856)
Unvested awards outstanding at September 30, 2019 244,679 244,679
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 83.99
Awards granted   170.12
Awards modified   168.36
Awards vested   80.34
Awards forfeited/cancelled   94.73
Unvested awards outstanding at September 30, 2019 $ 105.33 $ 105.33
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Number of Shares    
Unvested awards outstanding at January 1, 2019   29,592
Awards granted   0
Awards modified   (29,592)
Unvested awards outstanding at September 30, 2019 0 0
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 121.75
Awards granted   0
Awards modified   121.75
Unvested awards outstanding at September 30, 2019 $ 0 $ 0
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Number of Shares    
Unvested awards outstanding at January 1, 2019   0
Awards granted   9,393
Awards modified   0
Unvested awards outstanding at September 30, 2019 9,393 9,393
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 0
Awards granted   165.87
Awards modified   0
Unvested awards outstanding at September 30, 2019 $ 165.87 $ 165.87
Other 2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Number of Shares    
Awards granted 9,394  
Other 2019 Acquisitions | Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units    
Number of Shares    
Awards granted 7,280  
Other 2019 Acquisitions | Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Number of Shares    
Awards granted 9,393  
2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Number of Shares    
Awards granted   21,933