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OPTIONS AND AWARDS - NARRATIVE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchase of subsidiary shares $ 2,687 $ 1,972 $ 0
Proceeds from sale of subsidiary shares 2,293 $ 1,972 $ 0
The Ensign Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested options, cost not yet recognized $ 4,245    
Options, grant date intrinsic value (in dollars per share) $ 0    
Options, unvested and outstanding (in shares) 966    
Weighted average contractual life for options outstanding, vested and expected to vest 7 years 4 months 24 days    
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 $ 23,530    
Unvested options and stock awards, cost net yet recognized, period for recognition 3 years 2 months 12 days    
Vesting period 5 years    
Issued price of awards granted (in dollars per share) $ 0    
Subsidiary Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased (in shares) 599 865  
Repurchase of subsidiary shares $ 2,687 $ 1,972  
Shares issued (in shares) 534 865  
Proceeds from sale of subsidiary shares $ 2,293 $ 1,972  
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