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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Trade receivables, allowance for doubtful accounts | $ 8,302 | $ 7,821
Common stock, par value (dollars per share) | $ 0 | $ 0
Preferred Stock, 4 1/2% Cumulative |  |
Percentage of cumulative preferred stock | 4.50% | 4.50%
Preferred stock, par value (dollars per share) | $ 50 | $ 50

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