SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)	38,811	37,086
Vested share-based awards withheld to satisfy income tax obligations	$ 2,800	$ 3,600
Compensation Expense [Abstract]
Share-based compensation expense	1,919	1,693
401(k) Profit Sharing Plan [Abstract]
Contribution to profit sharing plan	$ 700	$ 500
Restricted Stock [Member]
Number of Shares [Roll Forward]
Nonvested at beginning of period (in shares)	224,000
Granted (in shares)	85,586
Vested (in shares)	(107,238)
Forfeited (in shares)	(67)
Nonvested at end of period (in shares)	202,281
Weighted Average Grant-date Fair Value [Roll Forward]
Nonvested at beginning of period (in dollars per share)	$ 67.70
Granted (in dollars per share)	72.50
Vested (in dollars per share)	60.92
Forfeited (in dollars per share)	79.70
Nonvested at end of period (in dollars per share)	$ 73.32
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 13,600
Unrecognized compensation expense, period for recognition	36 months
2017 Director LTIP [Member] \| Restricted Stock [Member]
Number of Shares [Roll Forward]
Granted (in shares)	454	841
2012 Employee LTIP [Member] \| Restricted Stock [Member]
Number of Shares [Roll Forward]
Granted (in shares)	85,132	69,847
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)	38,811
Vested share-based awards withheld to satisfy income tax obligations	$ 2,800

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cost for defined contribution plan.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of noncash expense for share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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