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Accrued Core Payment (Details) - USD ($)
Mar. 31, 2016
Mar. 31, 2015
Accrued Core Payment [Abstract]    
2017 $ 9,536,000  
2018 9,442,000  
2019 8,567,000  
Total accrued core payments 27,545,000  
Less amount representing interest (1,006,000)  
Present value of accrued core payments 26,539,000 $ 37,070,000
Less current portion of accrued core payments (8,989,000) (13,190,000)
Long-term portion of accrued core payments $ 17,550,000 $ 23,880,000