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Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Allowance for doubtful accounts, current | $ 12,100 | $ 14,915
Operating property and equipment, accumulated depreciation | 1,167,152 | 1,128,040
Finite-Lived intangible assets, accumulated amortization | $ 54,463 | $ 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) | 52,983,373 | 53,463,118

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