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STOCK-BASED COMPENSATION (Retricted Stock and Restricted Stock Units Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Number of Shares      
Unvested awards outstanding, beginning of period 793 1,840 154,125
Awards granted 9,394 0 0
Awards modified 0 0 0
Awards vested (396) (1,047) (152,285)
Awards forfeited/cancelled 0 0 0
Unvested awards outstanding, end of period 9,791 793 1,840
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 63.10 $ 54.37 $ 40.89
Awards granted 167.18 0 0
Awards modified 0 0 0
Awards vested 63.10 47.76 43.39
Awards forfeited/cancelled 0 0 0
Unvested awards outstanding, end of period $ 162.96 $ 63.10 $ 54.37
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Unvested awards outstanding, beginning of period 797,903 688,012 485,188
Awards granted 284,269 380,864 424,623
Awards modified 6,897 (3,110) (2,570)
Awards vested (286,654) (217,800) (140,043)
Awards forfeited/cancelled (43,630) (50,063) (79,186)
Unvested awards outstanding, end of period 758,785 797,903 688,012
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 92.13 $ 71.60 $ 67.69
Awards granted 170.29 115.84 73.89
Awards modified 170.74 80.27 26.85
Awards vested 87.79 70.10 66.54
Awards forfeited/cancelled 114.45 86.97 70.30
Unvested awards outstanding, end of period $ 122.48 $ 92.13 $ 71.60
Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Unvested awards outstanding, beginning of period 302,967 314,829 204,501
Awards granted 55,923 85,380 170,295
Awards modified 668 3,110 2,570
Awards vested (110,643) (91,684) (52,004)
Awards forfeited/cancelled (6,627) (8,668) (10,533)
Unvested awards outstanding, end of period 242,288 302,967 314,829
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 83.99 $ 72.50 $ 70.53
Awards granted 170.13 112.65 74.21
Awards modified 168.36 120.18 73.27
Awards vested 80.51 72.69 70.56
Awards forfeited/cancelled 94.77 81.40 71.72
Unvested awards outstanding, end of period $ 105.40 $ 83.99 $ 72.50
Performance Targets | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Number of Shares      
Unvested awards outstanding, beginning of period 0 0 5,573
Awards granted 9,393 0 0
Awards modified 0    
Awards vested   0 (5,573)
Awards forfeited/cancelled   0 0
Unvested awards outstanding, end of period 9,393 0 0
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 0 $ 0 $ 33.47
Awards granted 165.87 0 0
Awards modified 0    
Awards vested   0 33.47
Awards forfeited/cancelled   0 0
Unvested awards outstanding, end of period $ 165.87 $ 0 $ 0
Performance Targets | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Unvested awards outstanding, beginning of period 29,592 0 4,667
Awards granted 0 45,375 0
Awards modified (29,592)    
Awards vested   (8,769) 0
Awards forfeited/cancelled   (7,014) (4,667)
Unvested awards outstanding, end of period 0 29,592 0
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 121.75 $ 0 $ 70.22
Awards granted 0 121.75 0
Awards modified 121.75    
Awards vested   121.75 0
Awards forfeited/cancelled   121.75 70.22
Unvested awards outstanding, end of period $ 0 $ 121.75 $ 0
Performance Targets | Liability Classified Award | Equity-Settled Award | Restricted Stock      
Number of Shares      
Unvested awards outstanding, beginning of period 0 0 105,602
Awards granted 0 0 0
Awards modified 0    
Awards vested   0 (105,602)
Awards forfeited/cancelled   0 0
Unvested awards outstanding, end of period 0 0 0
Weighted Average Grant Date Fair Value Per Share (in dollars per share)      
Unvested awards outstanding, beginning of period $ 0 $ 0 $ 38.86
Awards granted 0 0 0
Awards modified 0    
Awards vested   0 38.86
Awards forfeited/cancelled   0 0
Unvested awards outstanding, end of period $ 0 $ 0 $ 0
2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Number of Shares      
Awards granted 9,394    
2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Awards granted 21,933    
2019 Acquisitions | Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Awards granted 7,280    
2019 Acquisitions | Performance Targets | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Number of Shares      
Awards granted 9,393    
2018 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Awards granted   88,578  
Year 2020 | 2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Awards granted 5,793    
Year 2020 | 2019 Acquisitions | Performance Targets | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSUs)      
Number of Shares      
Awards granted 24,836