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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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