GOODWILL AND INTANGIBLE ASSETS - Summary of Indefinite and Finite-Lived Intangible Assets (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Intangible Assets [Roll Forward]
Intangible Assets, net beginning of period	$ 29,039
Intangible assets divested	(151)
Less: amortization expense	(4,112)
Intangible Assets, net end of period	$ 24,776

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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