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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards $ 32,000      
Net operating loss carryforwards, tax effected 12,350 $ 23,800    
Operating loss carryforwards, limitation on use, annual amount 33,000      
Unrecognized tax benefits $ 4,084 $ 3,420 $ 1,236 $ 1,016
Effective income tax rate, change in enacted tax rate 2.60% 2.70% 1.20%  
Earnings U.S income taxes not provided by $ 27,800      
Uncertain tax liability 2,200      
Subsidiaries        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards, tax effected $ 11,200