XML 52 R42.htm IDEA: XBRL DOCUMENT v3.19.1
Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jun. 01, 2014
shares
Feb. 28, 2019
installment
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized stock-based compensation expense related to unvested awards | $     $ 6.9
Weighted average remaining vesting period related to expense recognition     2 years 4 months 30 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  
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