SEGMENT REPORTING, Reconciliation of operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Adjustment for [Abstract]
Amortization of intangible assets	$ 4,358	$ 4,316
Income from operations	11,149	8,236
Interest expense	5,041	3,653
Other income, net	(22)	(228)
Income before provision for income taxes	6,130	4,811
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Operating income for reportable segments, excluding amortization	26,266	20,908
Adjustment for [Abstract]
Income from operations	21,908	16,592
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangible assets	4,358	4,316
Corporate expense	$ 10,759	$ 8,356

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Operating income for reportable segments before amortization of intangibles, corporate and other expense, net.

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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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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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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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