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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jun. 01, 2014
shares
May 31, 2019
$ / shares
shares
Feb. 28, 2019
installment
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unamortized stock-based compensation expense related to unvested awards | $       $ 6.2
Weighted average remaining vesting period related to expense recognition       2 years 3 months 18 days
Ensign Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock award conversion ratio related to the spin-off 1      
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      
Unvested stock awards outstanding (in shares)       1,760
Restricted Stock Award | Officers and Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     91,440  
Award grant date fair value (in usd per share) | $ / shares     $ 22.00  
Number of equal annual vesting installments | installment     4  
Restricted Stock Award | Board of Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)   17,749    
Award grant date fair value (in usd per share) | $ / shares   $ 24.23    
Performance Stock Award | Officers and Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     71,440  
Award grant date fair value (in usd per share) | $ / shares     $ 22.00  
Vesting metric, Normalized Funds from Operations, minimum     5.00%  
Minimum | Performance Stock Award | Officers and Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period range (in years)     1 year  
Maximum | Performance Stock Award | Officers and Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period range (in years)     4 years