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Intangible Assets and Goodwill Expected Amortization of Finite-lived Intangible Assets (Details)
$ in Thousands
May. 31, 2015
USD ($)
Expected Amortization of Finite-lived Intangible Assets [Abstract]  
2015 $ 1,514
2016 1,514
2017 1,255
2018 1,076
2019 $ 1,076