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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowances $ 9,742 $ 33,462
Inventory reserves 8,584 9,020
Accumulated depreciation 217,353 210,763
Accumulated amortization $ 67,413 $ 66,065
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized shares (in shares) 125,000,000 125,000,000
Common stock, issued shares (in shares) 30,369,000 30,447,000
Common stock, outstanding shares (in shares) 30,369,000 30,447,000