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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Sep. 30, 2019
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 Unsecured Notes and Private Placement Senior Unsecured Notes at September 30, 2019 is as follows:
|  | Fair Value |
|  | (dollars in thousands) |
Series 2007A Tranche D |  | $ | 36,508 |
4.500% Senior Unsecured Notes Due 2026 |  | $ | 365,032 |

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