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OPTIONS AND AWARDS - NARRATIVE (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
The Ensign Plans  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested options, cost not yet recognized | $ $ 5,474
Options, grant date intrinsic value (in dollars per share) | $ / shares $ 0
The Ensign Plans | Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested options and stock awards, cost net yet recognized, period for recognition 4 years 4 months 24 days
Options, vesting percent per year 20.00%
Options, expiration period 10 years
The Ensign Plans | Restricted stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested stock awards, cost not yet recognized | $ $ 15,051
Unvested options and stock awards, cost net yet recognized, period for recognition 2 years 6 months
Vesting period 5 years
Issued price of awards granted (in dollars per share) | $ / shares $ 0
Minimum | Restricted stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
Maximum | Restricted stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 5 years