SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selling, General and Administrative Expense [Abstract]
Compensation and benefits	$ 55,577	$ 54,897	$ 45,098
Professional services	23,284	23,183	18,598
Occupancy related costs	37,370	39,917	38,262
Amortization of intangible assets	47,576	41,135	37,680
Depreciation and amortization	10,001	9,781	7,548
Marketing costs	27,847	27,499	24,130
Other	12,500	24,456	30,417
Total	$ 214,155	$ 220,868	$ 201,733