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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Trade, allowance for doubtful accounts $ 9,374 $ 8,887
Equity:    
Common stock, par value per share (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 120,000,000 120,000,000
Common stock, shares issued (in shares) 59,776,000 59,776,000
Treasury stock, shares (in shares) 6,056,000 2,906,000