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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Trade receivables, allowance for doubtful accounts | $ 8,045 | $ 8,189
Common stock, par value (dollars per share) | $ 0 | $ 0
Preferred Stock, 4 1/2% Cumulative |  |
Preferred stock, par value (dollars per share) | $ 50 | $ 50
Preferred Stock, Dividend Rate, Percentage | 4.50% | 4.50%

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