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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding (in shares)     0
Total fair value of units vested $ 3,600,000 $ 8,400,000 $ 4,700,000
Stock-based compensation expense 7,648,000 8,359,000 7,496,000
Total unrecognized stock-based compensation expense $ 19,300,000    
Weighted average period to recognized stock-based compensation expense 2 years 6 months    
Discretionary matching contribution percent 3.00%    
Matching contributions $ 171,000 143,000 73,000
General and Administrative Expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 7,600,000 $ 7,000,000 $ 7,500,000
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining vesting period 2 years 6 months    
Weighted average fair value per share (in dollars per share) $ 16.02 $ 19.38 $ 22.05
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) 1,200,000 1,700,000  
Exercise price range, minimum (in dollars per share) $ 24.24    
Exercise price range, maximum (in dollars per share) 34.09    
Weighted average exercise price (in dollars per share) $ 28.04 $ 27.92  
Stock options exercised (in shares) 0    
Stock options expired (in shares) 500,000    
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