LONG-TERM INCENTIVE COMPENSATION (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020 CAD ($) shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount of shares purchased in the open market		$ 3,947,000	$ 981,000
Remaining unrecognized compensation cost recognized over a remaining weighted average period	3 years	3 years
Accrued liability		$ 28,000		$ 79,000
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total number of shares that may be issued under the stock based compensation Plan (including predecessor plans to the Plan) | shares		5,048,100
Shares remain available for issuance | shares		286,376
Remaining unrecognized compensation cost		$ 17,500,000
Nonvested restricted shares | shares		510,319		396,598
Expense related to mutual fund share incentive awards		$ 2,616,000	3,252,000
Canadian Plan | Westwood International Advisors Inc
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remain available for issuance | shares		53,000
Share Based Compensation Arrangement By Share Based Payment Award Available For Grant, Original	$ 10.0	$ 7,100,000
Fund purchases of common stock		63,712
Purchases of common stock with respect to awards granted	$ 1.4	$ 1,000,000.0
Share price | $ / shares		$ 18.31
Amount of shares purchased in the open market		$ 700,000
Purchases of treasury stock, shares | shares	27,474	27,474
Remaining unrecognized compensation cost		$ 700,000
Remaining unrecognized compensation cost recognized over a remaining weighted average period	1 year 8 months 12 days	1 year 8 months 12 days
Mutual Fund Share Incentive Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period of mutual fund share incentive award	3 years	3 years
Expense related to mutual fund share incentive awards		$ 9,000	$ 8,000