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OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Other current assets    
Prepaid expenses and other $ 9,058 $ 6,622
Post-closing receivable from IPG (see Note 5 - Discontinued Operations and Dispositions) 17,625 0
Interest receivable 2,497 0
Assets of non-qualified retirement plan (see Note 7 - Other Accrued Expenses) 14,970 13,551
Other current assets 44,150 20,173
Other noncurrent assets    
Acquired intangible assets, net 24,217 33,911
Other miscellaneous noncurrent assets 8,282 3,943
Other assets, net $ 32,499 $ 37,854