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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) operating_segments	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of business segments (in segments) | operating_segments			2
Segment Reporting Information, Revenue [Abstract]
Revenues	$ 212,711	$ 189,078	$ 619,319	$ 518,755
Reconciliation of EBITDA to net income (loss) [Abstract]
Net income (loss)	23,201	(5,362)	55,498	(26,455)
Purchase amortization in cost of revenues	5,736	9,964	17,119	22,887
Purchase amortization in operating expenses	5,550	7,153	17,602	21,260
Depreciation and other amortization	6,794	5,403	18,320	14,860
Interest income	(344)	(42)	(587)	(473)
Interest expense	2,498	2,363	7,462	7,060
Income tax expense (benefit), net	14,241	2,610	35,643	(4,199)
EBITDA	57,676	22,089	151,057	34,940
Intersegment Revenue [Member]
Segment Reporting Information, Revenue [Abstract]
Revenues	3	4	24	25
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
North America corporate allocation	70	225	379	763
Segment Reporting Information, Revenue [Abstract]
Revenues	205,637	182,556	598,757	500,059
Reconciliation of EBITDA to net income (loss) [Abstract]
EBITDA	56,305	20,993	148,296	32,816
Operating Segments [Member] | International [Member]
Segment Reporting Information [Line Items]
International corporate allocation	113	74	246	200
Segment Reporting Information, Revenue [Abstract]
Revenues	7,077	6,526	20,586	18,721
Reconciliation of EBITDA to net income (loss) [Abstract]
EBITDA	1,371	1,096	2,761	2,124
Operating Segments [Member] | International [Member] | External Customers [Member]
Segment Reporting Information, Revenue [Abstract]
Revenues	7,074	6,522	20,562	18,696
Intersegment Eliminations [Member]
Segment Reporting Information, Revenue [Abstract]
Revenues	$ (3)	$ (4)	$ (24)	$ (25)

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Cost incurred for domestic employees involved in the management and expansion activities of the company's International operating segment.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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