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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Allowance for accounts receivable | $ 8,441 | $ 8,628
Shareholders' Equity: |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000
Common stock, shares outstanding (in shares) | 19,200,923 | 19,208,067
Series A preferred stock |  |
Shareholders' Equity: |  |
Preferred stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000
Series B preferred stock |  |
Shareholders' Equity: |  |
Preferred stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000

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