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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Jun. 30, 2018
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 June 30, 2018 is as follows:
|  | Fair Value |
|  | (dollars in thousands) |
Series 2007A Tranche D |  |  | 37,583 |
4.500% Senior Unsecured Notes Due 2026 |  |  | 348,768 |

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