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LONG-TERM DEBT: (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018
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Debt Instrument [Line Items] |  |
Total long-term debt and capital leases |  | $ 233,293
Less current installments |  | 1,583
Less deferred debt financing costs |  | 3,873
Long-term debt, excluding current installments and deferred debt financing costs | $ 0 | 227,837
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total long-term debt and capital leases |  | 230,000
Other debt and long-term liabilities |  |
Debt Instrument [Line Items] |  |
Total long-term debt and capital leases |  | $ 3,293

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