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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Activity) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Number of Shares    
Unvested awards outstanding at January 1, 2019   793
Awards granted   0
Awards modified   0
Awards vested   0
Awards forfeited/cancelled   0
Unvested awards outstanding at June 30, 2019 793 793
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 63.10
Awards granted   0
Awards modified   0
Awards vested   0
Awards forfeited/cancelled   0
Unvested awards outstanding at June 30, 2019 $ 63.10 $ 63.10
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   274,381
Awards modified   6,897
Awards vested   (255,903)
Awards forfeited/cancelled   (18,742)
Unvested awards outstanding at June 30, 2019 804,536 804,536
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 92.13
Awards granted   169.93
Awards modified   170.74
Awards vested   86.05
Awards forfeited/cancelled   103.44
Unvested awards outstanding at June 30, 2019 $ 121.01 $ 121.01
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   48,632
Awards modified   668
Awards vested   (110,012)
Awards forfeited/cancelled   (2,648)
Unvested awards outstanding at June 30, 2019 239,607 239,607
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 83.99
Awards granted   169.13
Awards modified   168.36
Awards vested   80.34
Awards forfeited/cancelled   91.52
Unvested awards outstanding at June 30, 2019 $ 103.10 $ 103.10
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Number of Shares    
Unvested awards outstanding at January 1, 2019   29,592
Awards modified   (29,592)
Unvested awards outstanding at June 30, 2019 0 0
Weighted Average Grant Date Fair Value Per Share    
Unvested awards outstanding at January 1, 2019   $ 121.75
Awards modified   121.75
Unvested awards outstanding at June 30, 2019 $ 0 $ 0
test IO | Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Number of Shares    
Awards granted 17,565