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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Fair Value of Senior Notes | The fair value of our senior notes has been estimated based upon our current incremental borrowing rates for similar types of borrowing arrangements. The fair value of our Senior Notes at March 31, 2016 is as follows:
|  | Fair Value |
|  | (dollars in thousands) |
Series 2005A Tranche C |  |  | $ 60,271 |
Series 2007A Tranche B |  |  | 8,367 |
Series 2007A Tranche C |  |  | 25,742 |
Series 2007A Tranche D |  |  | 40,555 |

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