Accrued Core Payment (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Accrued Core Payment [Abstract]
2016	$ 13,882,000
2017	8,275,000
2018	8,275,000
2019	8,275,000
Total accrued core payments	38,707,000
Less amount representing interest	(1,637,000)
Present value of accrued core payments	37,070,000
Less current portion	(13,190,000)	0
Total noncurrent accrued core payments	$ 23,880,000	$ 0