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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Accounts receivable, allowance $ 1,550 $ 2,000
Accumulated Amortization $ 37,049 $ 30,777
Preferred stock, par value $ 1.00 $ 1.00
Preferred stock, shares authorized 100,000 100,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.16 $ 0.16
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 51,735,732 50,932,489
Common stock, shares outstanding 51,735,732 50,932,489
Customer-based intangibles    
Accumulated Amortization $ 24,579 $ 20,846
Other Intangible Assets    
Accumulated Amortization $ 12,470 $ 9,931