EQUITY AND EPS - Computations of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operations:
Net income	$ 31,658	$ 23,673	$ 20,059	$ 15,427	$ 11,632	$ 10,381	$ 8,490	$ 9,842	$ 90,817	$ 40,345	$ 38,793
Net loss attributable to noncontrolling interest									490	0	0
Income attributable to participating securities (unvested shares and units)									(712)	(261)	(253)
Net income used in Earnings Per Share calculation, basic									90,595	40,084	38,540
Net income used in Earnings Per Share calculation, diluted									$ 90,595	$ 40,084	$ 38,540
Share information:
Weighted average common shares, basic (in shares)									20,719,663	16,937,125	17,012,288
Weighted average common shares, diluted (in shares)									20,982,453	16,937,125	17,012,288
Earnings per share, basic (in dollars per share)	$ 1.44	$ 1.08	$ 0.91	$ 0.90	$ 0.69	$ 0.61	$ 0.50	$ 0.57	$ 4.37	$ 2.37	$ 2.27
Earnings per share, diluted (in dollars per share)	$ 1.40	$ 1.08	$ 0.91	$ 0.90	$ 0.69	$ 0.61	$ 0.50	$ 0.57	$ 4.34	$ 2.37	$ 2.27
Dilutive effect of convertible senior notes (in shares)									262,790	0	0
Restricted Stock Units (RSUs)
Share information:
Participating securities (in shares)									163,024	110,665	111,365