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OPTIONS AND AWARDS - AGGREGATE INTRINSIC VALUE OF OPTIONS (Details) - The Ensign Plans - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding $ 6,433 $ 6,545
Vested 4,848 4,604
Expected to vest 1,586 1,941
Exercisable $ 4,123 $ 2,263