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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Statement of Financial Position [Abstract] |  |  |
Trade receivables, allowance for doubtful accounts |  | $ 5,068 | $ 4,860
Common stock, par value (dollars per share) |  | $ 0 | $ 0
Preferred Stock |  |  |
Preferred stock, dividend rate (percentage) | 4.50% | 4.50% |
Preferred stock, par value (dollars per share) |  | $ 50,000 | $ 50,000

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