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LONG-TERM DEBT: - Schedule of debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Long-term debt    
Total long-term debt   $ 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 borrowings    
Long-term debt    
Total long-term debt   230,000
Other debt    
Long-term debt    
Total long-term debt   $ 3,293