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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Accounts receivable, allowance $ 1,500 $ 1,300
Accumulated Amortization $ 24,807 $ 20,523
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 37,567,689 37,128,269
Common stock, shares outstanding 37,567,689 37,128,269
Customer-based intangibles    
Accumulated Amortization $ 17,277 $ 14,446
Other Intangible Assets    
Accumulated Amortization $ 7,530 $ 6,077