SEGMENT REPORTING, ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property and equipment, net	$ 85,442	$ 73,753
Goodwill	1,246,789	1,138,805	$ 718,587
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	2,166,043	2,180,664
Investment in subsidiaries	(18,344)	(18,344)
Intersegment receivables	(73,752)	(78,638)
Total assets	2,073,947	2,083,682
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	633,878	640,416
Intersegment payables	(66,084)	(70,280)
Total liabilities	567,794	570,136
North America [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	82,781	71,209
Goodwill	1,222,055	1,114,363	$ 692,639
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	2,124,922	2,138,768
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	558,696	564,832
International [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	2,661	2,544
Goodwill	24,734	24,442
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	41,121	41,896
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	$ 75,182	$ 75,584