EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic and diluted shares outstanding [Abstract]
Weighted average shares outstanding-basic (in shares)	7,320	7,976	7,412	7,945
Effect of dilutive shares (in shares)	25	44	49	62
Weighted average shares outstanding-diluted (in shares)	7,345	8,020	7,461	8,007
Calculation of earnings per share - basic [Abstract]
Net earnings	$ 11,952	$ 8,591	$ 21,429	$ 16,441
Net earnings attributable to participating securities	0	66	55	192
Net earnings attributable to common shareholders	11,952	8,525	21,374	16,249
Earnings per share - basic (in dollars per share)	$ 1.63	$ 1.07	$ 2.88	$ 2.05
Calculation of earnings per share - diluted [Abstract]
Net earnings attributable to common shareholders- basic	11,952	8,525	21,374	16,249
Add: undistributed earnings attributable to participating securities	0	0	1	1
Net earnings attributable to common shareholders- diluted	$ 11,952	$ 8,525	$ 21,375	$ 16,250
Earnings per share - diluted (in dollars per share)	$ 1.63	$ 1.06	$ 2.86	$ 2.03