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Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Receivables, net of allowance of $13,192 and $14,915, respectively | $ 13,192 | $ 14,915
Operating property and equipment, net of accumulated depreciation of $1,187,188 and $1,128,040, respectively | 1,187,188 | 1,128,040
Intangible assets, net of accumulated amortization of $55,934 and $51,578, respectively | $ 55,934 | $ 51,578
Shareholders’ equity: |  |
Preferred stock, shares authorized (in shares) | 3,800,917 | 3,800,917
Preferred stock, shares outstanding (in shares) | 0 | 0
Common stock, par value (in dollars per share) | $ 0.50 | $ 0.50
Common stock, shares authorized (in shares) | 400,000,000 | 400,000,000
Common stock, shares outstanding (in shares) | 52,947,715 | 53,463,118

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