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Intangible Assets, Amortization Expense (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Amortization of intangible assets [Abstract]        
Amortization expense $ 543,000 $ 495,000 $ 1,628,000 $ 1,464,000
Estimated future amortization expense for intangible assets subject to amortization [Abstract]        
2013 - remaining 3 months 544,000   544,000  
2014 2,070,000   2,070,000  
2015 1,996,000   1,996,000  
2016 1,675,000   1,675,000  
2017 1,592,000   1,592,000  
Thereafter 12,979,000   12,979,000  
Total $ 20,856,000   $ 20,856,000