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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Trade receivables, allowance for doubtful accounts | $ 5,540 | $ 5,610
Percentage of cumulative preferred stock | 4.50% | 4.50%
Preferred stock, par value (dollars per share) | $ 50 | $ 50
Common stock, par value (dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 180,000,000 | 180,000,000
Common stock, shares issued (in shares) | 62,081,391 | 62,081,391
Common stock, shares outstanding (in shares) | 38,222,928 | 37,736,578

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