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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Sep. 30, 2016
Fair Value Disclosures [Abstract] |
Fair Value of Senior Notes | The fair value of our long-term debt has been estimated based upon our current incremental borrowing rates for similar types of borrowing arrangements. The fair value of our Senior Notes at September 30, 2016 is as follows:
|  | Fair Value
|  | (dollars in thousands)
Series 2005A Tranche C |  |  | 58,814
Series 2007A Tranche B |  |  | 8,002
Series 2007A Tranche C |  |  | 24,813
Series 2007A Tranche D |  |  | 39,730
4.5% Senior Unsecured Notes Due 2026 |  |  | 356,195

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