SEGMENT REPORTING, ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Property and equipment, net	$ 87,568	$ 88,311
Goodwill	1,254,866	1,252,945	$ 1,138,805
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	2,185,063	2,079,571
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total liabilities	530,850	535,791
North America [Member]
Segment Reporting Information [Line Items]
Goodwill	1,227,777	1,227,310	1,114,363
International [Member]
Segment Reporting Information [Line Items]
Goodwill	27,089	25,635	$ 24,442
Operating Segments [Member]
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	2,284,754	2,171,572
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total liabilities	570,890	598,110
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	84,727	86,191
Goodwill	1,227,777	1,227,310
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	2,239,587	2,130,202
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total liabilities	520,833	525,566
Operating Segments [Member] | International [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	2,841	2,120
Goodwill	27,089	25,635
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	45,167	41,370
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total liabilities	50,057	72,544
Consolidation Eliminations [Member]
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	(57,065)	(18,344)
Intersegment Eliminations [Member]
Reconciliation of operating segment assets to total assets [Abstract]
Total assets	(42,626)	(73,657)
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total liabilities	$ (40,040)	$ (62,319)