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Period Type:	duration

DIVIDENDS, SHARE REPURCHASES AND EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Quarter To Date [Member]	Jun. 30, 2012 Quarter To Date [Member]	Jun. 30, 2013 Quarter To Date [Member] Stock Options [Member]	Jun. 30, 2012 Quarter To Date [Member] Stock Options [Member]	Jun. 30, 2013 Quarter To Date [Member] Restricted Stock Units [Member]	Jun. 30, 2012 Quarter To Date [Member] Restricted Stock Units [Member]	Jun. 30, 2013 Quarter To Date [Member] Restricted Stock Awards [Member]	Jun. 30, 2012 Quarter To Date [Member] Restricted Stock Awards [Member]	Sep. 30, 2013 Subsequent Event [Member]
Dividends, Share Repurchases and Earnings Per Share [Line Items]
Cash dividends declared per common share	$ 0.25	$ 0.20									$ 0.25
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding					396,801	376,490	0	72,592	43,077	0
Weighted average exercise price					$ 47.40	$ 43.65	$ 0	$ 46.59	$ 62.65	$ 0
Income available to common stockholders - basic			$ 26,886	$ 23,662
Interest expense on assumed conversion of 3% Convertible Notes, net of tax			0	0
Income available to common stockholders - diluted			$ 26,886	$ 23,662
Weighted average number of common shares outstanding - basic			36,182,708	35,789,700
Assumed conversion of 3% Convertible Senior Noted outstanding during the period			0	0
Net effect of dilutive stock options, restricted stock units and restricted stock awards based on the treasury stock method			393,577	659,888
Weighted average number of common shares outstanding - diluted			36,576,285	36,449,588
Basic earnings per share	$ 0.74	$ 0.66	$ 0.74	$ 0.66
Diluted earnings per share	$ 0.74	$ 0.65	$ 0.74	$ 0.65
Earnings Per Share Potentially Dilutive Securities	1.5 million	1.5 million
Debt Instrument Convertible Terms Of Conversion Feature	the base conversion price of the notes was approximately $74.81, based on the base conversion rate of 13.3666 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 8.6882 shares of our Common Stock per $1,000 principal amount of notes, as determined pursuant to a specified formula.
Debt Instrument, Convertible, Conversion Price	$ 74.81