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CAPITAL STOCK - Activity of Common Stock Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock:      
Balance, beginning of period (in shares) 17,604,092    
Balance, end of period (in shares) 19,208,067 17,604,092  
Common Stock      
Common Stock:      
Balance, beginning of period (in shares) 17,460,000 17,401,000 17,316,000
Issuance of shares for compensation net of withholding (in shares) 54,000 59,000 85,000
Issuance of common stock related to equity distribution agreements (in shares) 46,000 0 0
Issuance of common stock related to purchase of businesses (in shares) 1,481,000 0 0
Balance, end of period (in shares) 19,041,000 17,460,000 17,401,000