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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 12,477 $ 10,813
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 135,000,000 135,000,000
Common stock, shares issued (in shares)   54,848,523
Common stock, shares outstanding (in shares) 42,478,439 42,620,750
Treasury stock (in shares) 12,601,907 12,227,773