EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 20,098	$ 16,188	$ 18,003	$ 15,273	$ 36,286	$ 33,276
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding - basic (in shares)	13,312		13,494		13,334	13,464
Effect of dilutive shares (in shares)	38		92		74	133
Weighted average shares common outstanding - diluted (in shares)	13,350		13,586		13,408	13,597
Earnings per common share - basic (in dollars per share)	$ 1.51		$ 1.33		$ 2.72	$ 2.47
Earnings per common share - diluted (in dollars per share)	$ 1.51		$ 1.33		$ 2.71	$ 2.45