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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 19,843 $ 17,182
Accumulated depreciation 1,236,227 1,256,037
Accumulated amortization $ 71,298 $ 65,048
Preferred stock, par value (in dollars per share) $ 0 $ 0
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) 53,292,045 53,116,485