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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
Jun. 01, 2014
shares
Apr. 30, 2021
$ / shares
shares
Feb. 28, 2021
installment
company
$ / shares
shares
Jan. 31, 2021
installment
$ / shares
shares
Feb. 28, 2021
installment
Sep. 30, 2021
USD ($)
shares
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unamortized stock-based compensation expense related to unvested awards | $           $ 11.3  
Weighted average remaining vesting period related to expense recognition           2 years 1 month 6 days  
Restricted stock award | Ensign employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards unvested during spin-off (in shares) 207,580            
Shares forfeited (shares)             1,760
Unvested stock awards outstanding (in shares)           0  
Restricted stock award | Officers and employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards granted (in shares)     99,189 140,514      
Award grant date fair value (in usd per share) | $ / shares     $ 22.18 $ 22.48      
Number of equal annual vesting installments | installment     3 3 3    
Restricted stock award | Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards granted (in shares)   20,266          
Award grant date fair value (in usd per share) | $ / shares   $ 24.18          
Performance stock award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Historical volatility term basis for expected volatility assumption         2 years 10 months 2 days    
Performance stock award | Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards granted (in shares)     99,189 108,414      
Award grant date fair value (in usd per share) | $ / shares     $ 27.98 $ 22.48      
Vesting period (in years)     3 years        
Number of publicly traded healthcare REITs in peer group | company     16        
Performance stock award | Minimum | Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)       1 year      
Percentage of awards to vest relative To initial grant based on TSR performance     0.00%        
Performance stock award | Maximum | Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)       3 years      
Percentage of awards to vest relative To initial grant based on TSR performance     200.00%