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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Thousands
Nov. 30, 2017
May 31, 2017
Accounts receivable, allowance $ 1,800 $ 2,000
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 51,508,548 50,932,489
Common stock, shares outstanding 51,508,548 50,932,489
Customer-based intangibles    
Accumulated Amortization $ 22,808 $ 20,846
Other Intangible Assets    
Accumulated Amortization $ 11,089 $ 9,931