GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Impairment of goodwill	$ 0	$ 251,850	$ 0
Depreciation and amortization expense	$ 6,200	$ 5,100	$ 6,600
Goodwill \| Minimum
Goodwill [Line Items]
Growth rate	3.00%
EBITDA margin	0.06
Discount rate	9.00%
Goodwill \| Maximum
Goodwill [Line Items]
Growth rate	5.00%
EBITDA margin	0.08
Discount rate	11.00%

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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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value.

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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