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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 10,813 $ 12,643
Preferred stock, par value (usd 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 (usd 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 54,595,105
Common stock, shares outstanding (in shares) 42,620,750 41,915,000
Treasury stock, shares (in shares) 12,227,773 12,680,105