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CAPITAL STOCK - Stock Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock Compensation Expense $ 5,951 $ 5,041 $ 4,135
Equity based stock option expense      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock Compensation Expense 570 617 691
Restricted and performance-based stock awards expense      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock Compensation Expense 5,346 4,404 3,400
Stock compensation expense for equity based awards      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock Compensation Expense 5,916 5,021 4,091
Liability based stock option expense      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock Compensation Expense $ 35 $ 20 $ 44