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Consolidated Statement of Equity - 3 months ended Aug. 31, 2015 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Non-controlling Interest
Beginning Balance (in shares) at May. 31, 2015 37,128,269 37,128,000        
Beginning Balance at May. 31, 2015 $ 350,963 $ 5,941 $ 131,906 $ (2,442) $ 215,569 $ (11)
Issuance of shares of common stock under equity compensation plans, and share based compensation (in shares)   235,000        
Issuance of shares of common stock under equity compensation plans, and share based compensation 6,007 $ 38 5,969      
Issuance of shares under employee stock purchase plan (in shares)   9,000        
Issuance of shares under employee stock purchase plan 360 $ 1 359      
Comprehensive income:            
Net income (loss) for the three months ended August 31, 2015 9,289       9,323 (34)
Other comprehensive loss $ (713)     (713)    
Ending Balance (in shares) at Aug. 31, 2015 37,372,476 37,372,000        
Ending Balance at Aug. 31, 2015 $ 365,906 $ 5,980 $ 138,234 $ (3,155) $ 224,892 $ (45)