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CAPITAL STOCK - Activity of Common Stock Outstanding (Details) - shares | 12 Months Ended
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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

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