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STOCK BASED COMPENSATION - Other equity instruments (Details)
12 Months Ended
Mar. 23, 2018
EquityInstruments
Dec. 31, 2017
USD ($)
EquityInstruments
shares
Dec. 31, 2016
USD ($)
EquityInstruments
shares
May 31, 2015
shares
Apr. 30, 2015
shares
ISPP          
Share based compensation          
Percentage of contribution to the plan by participants from their annual salaries   10.00%      
Percentage of contribution to the plan by company on the participants contribution   50.00%      
Total compensation cost   $ 5,800,000 $ 5,100,000    
Number of common shares subscribed | shares   382,663 344,778    
Value of common shares subscribed   $ 17,400,000 $ 15,400,000    
Maximum number of common shares reserved for issuance | shares       7,100,000 6,100,000
Number of awards available for grant | shares   1,172,307 1,554,970    
RSU          
Share based compensation          
Number of awards granted | EquityInstruments   369,623 354,592    
Fair value at grant date   $ 44.42 $ 28.62    
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market   16,400,000 10,100,000    
Total compensation expense recorded in the general and administrative   $ 13,100,000 $ 10,400,000    
PSU          
Share based compensation          
Vesting period   3 years      
Number of awards granted | EquityInstruments   182,000 183,000    
Fair value at grant date   $ 49.38 $ 32.20    
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market   8,100,000 5,300,000    
Total compensation expense recorded in the general and administrative   $ 6,000,000 $ 2,200,000    
Maximum | RSU          
Share based compensation          
Vesting period   3 years      
Subsequent events | RSU          
Share based compensation          
Number of awards granted | EquityInstruments 372,200        
Subsequent events | PSU          
Share based compensation          
Number of awards granted | EquityInstruments 180,000