GOODWILL AND INTANGIBLE ASSETS - Summary of Indefinite and Finite-Lived Intangible Assets (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Intangible Assets [Roll Forward]
Intangible assets, net beginning of period	$ 20,957
Intangible assets acquired	50,360
Intangible assets divested	(5,320)
Less: amortization expense	(10,471)
Intangible assets, net end of period	$ 55,526

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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