DIVIDENDS, SHARE REPURCHASES AND EARNINGS PER SHARE (TABLES)

6 Months Ended

Sep. 30, 2012

Dividends, Share Repurchases and Earning Per Share [Abstract]

Schedule of antidilutive securities

		Three Months Ended				Six Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Options:
	Outstanding	552,209		528,501		448,269		531,679
	Weighted average exercise price	$	43.56	$	36.85	$	43.81	$	36.81
Restricted stock units:
	Outstanding	4,040		83,925		58,016		83,937
	Weighted average price	$	53.89	$	46.70	$	46.97	$	46.70
Restricted stock awards:
	Outstanding	0		0		0		0
	Weighted average price	$	0.00	$	0.00	$	0.00	$	0.00

Schedule Of Earnings Per Share Basic And Diluted [Table Text Block]

				Three Months Ended					Six Months Ended
				September 30,					September 30,
				2012		2011			2012		2011
Net income available to common stockholders (in thousands):
		Income available to common stockholders – basic		$	29,668	$	2,711		$	53,330	$	23,756
		Interest expense on assumed conversion of 3% Convertible Senior
			Notes, net of tax (1)		0		0	0		0		0
		Income available to common stockholders – diluted		$	29,668	$	2,711		$	53,330	$	23,756
Shares:
	Weighted average number of common shares outstanding – basic			35,815,672		36,157,917			35,858,237		36,165,247
			(1)		0		0			0		0
		Net effect of dilutive stock options, restricted stock units and
			restricted stock awards based on the treasury stock method		526,620		614,191			601,940		659,893
	Weighted average number of common shares outstanding – diluted			36,342,292		36,772,108			36,460,177		36,825,140
	Basic earnings per common share			$	0.83	$	0.07		$	1.49	$	0.66
	Diluted earnings per common share			$	0.82	$	0.07		$	1.46	$	0.65
(1)			Diluted earnings per common share for the three and six months ended September 30, 2012 and 2011 excludes approximately 1.5 million potentially dilutive shares initially issuable upon the conversion of our 3% Convertible Senior Notes. The 3% Convertible Senior Notes will be convertible, under certain circumstances, using a net share settlement process, into a combination of cash and our Common Stock. As of September 30, 2012, the base conversion price of the notes was approximately $75.65, based on the base conversion rate of 13.218 shares of Common Stock per $1,000 principal amount of convertible notes (subject to adjustment in certain circumstances, including the payment of dividends). In general, upon conversion of a note, the holder will receive cash equal to the principal amount of the note and Common Stock to the extent of the note’s conversion value in excess of such principal amount. In addition, if at the time of conversion the applicable price of our Common Stock exceeds the base conversion price, holders will receive up to an additional 8.5916 shares of our Common Stock per $1,000 principal amount of notes, as determined pursuant to a specified formula. Such shares did not impact our calculation of diluted earnings per share for three and six months ended September 30, 2012 and 2011 as our stock price did not meet or exceed the base conversion price.