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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 13, 2019
Feb. 13, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options outstanding (in shares)   0 0    
Total fair value of units vested $ 8,400,000 $ 4,700,000 $ 8,500,000    
Stock-based compensation expense 8,359,000 7,496,000 6,123,000    
Total unrecognized stock-based compensation expense $ 15,200,000        
Weighted average period to recognized stock-based compensation expense 2 years 8 months        
Discretionary matching contribution percent 3.00%        
Matching contributions $ 143,000 73,000 35,000    
General and Administrative Expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 7,000,000 $ 7,500,000 $ 6,100,000    
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining vesting period 2 years 8 months        
Weighted average fair value per share (in dollars per share) $ 19.38 $ 22.05 $ 21.11    
FFO Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 0.00%        
FFO Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 250.00%        
TSR Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Historical volatility rate period 3 years        
TSR Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 0.00%        
TSR Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 200.00%        
Performance Incentive Plan of 2009 | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of common stock convertible upon each performance-based restricted stock unit vesting (in shares) 1        
Performance Incentive Plan of 2009 | Restricted Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Performance Incentive Plan of 2009 | Restricted Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 5 years        
Care Capital Properties          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options outstanding (in shares) 1,700,000        
Exercise price range, minimum (in dollars per share) $ 19.24        
Exercise price range, maximum (in dollars per share) 34.09        
Weighted average exercise price (in dollars per share) $ 27.92        
Aggregate intrinsic value $ 0        
Care Capital Properties | General and Administrative Expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 1,400,000        
Forecast          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options exercisable (in shares)       1,200,000 500,000