NATURE OF OPERATIONS AND BASIS OF PRESENTATION - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201911Member
Increase (decrease) of retained earnings	$ 122,775	$ 114,958		$ 191,479	$ 161,129	$ 152,750	$ 158,491
Accounts receivable, allowance for credit loss	1,088			1,143
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) of retained earnings				(359)			(39)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) of retained earnings	$ 53,967	$ 47,748		126,995	$ 101,997	$ 93,315	113,114
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) of retained earnings			$ (359)	$ (359)			$ (39)