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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Allowance for doubtful trade accounts receivable $ 8,436 $ 8,250
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 80,533,536 80,533,536
Common stock, shares outstanding 72,454,202 72,409,222
Treasury stock, shares 8,079,334 8,124,314