SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total provisions for allowance for credit losses on receivables	$ 2,299
Deferred compensation, mutual funds held by the trust	4,360
Deferred compensation obligations	5,657
Fair Value, Inputs, Level 2
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred compensation, mutual funds held by the trust	$ 2,571
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment terms, period	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment terms, period	60 days