Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 9,292	$ 10,022
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred Stock, shares issued
Preferred Stock, shares outstanding
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	135,000,000	135,000,000
Common Stock, shares issued	52,970,281	52,247,014
Common Stock, shares outstanding	47,840,204	47,800,129
Treasury stock, shares	5,130,077	4,446,885