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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]        
Long-term deferred tax assets $ 1,000      
Short-term deferred tax assets   $ 10,108    
Valuation allowance (3,437) 0    
Unrecognized tax benefits $ 3,651 $ 4,084 $ 3,420 $ 1,236
Effective income tax rate, change in enacted tax rate (3.30%) (2.60%) (2.70%)  
Earnings U.S income taxes not provided by $ 42,500      
Uncertain tax liability $ 4,800