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CAPITAL STOCK - NARRATIVE (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of stock options granted during period     $ 900,000 $ 4,400,000
Weighted average grant date fair value     $ 26.05 $ 28.74
Intrinsic value of options exercised     $ 11,800,000 $ 6,600,000
Proceeds from stock options exercised     $ 500,000 $ 3,000,000
Weighted average purchase price of shares purchased (in dollars per share) $ 16.62 $ 23.44 $ 18.03 $ 17.85
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised     $ 11,800,000  
Total unrecognized compensation expense related to outstanding stock options $ 4,200,000   $ 4,200,000  
Period for recognition of unrecognized compensation expense     1 year 3 months 11 days  
Intrinsic value of options outstanding $ 12,000,000   $ 12,000,000  
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period 3,032 1,942 8,401 7,396
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation expense related to outstanding stock options $ 2,600,000   $ 2,600,000  
Period for recognition of unrecognized compensation expense     1 year 1 month  
Weighted average purchase price of shares purchased (in dollars per share) $ 71.84 $ 98.41 $ 70.00 $ 71.77
Fair value of stock vested $ 0 $ 0 $ 300,000 $ 4,400,000
Performance shares, nonprobable performance targets (in shares) 193,000   193,000  
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     1 year  
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years