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SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selling, General and Administrative Expense [Abstract]      
Compensation and benefits $ 54,897 $ 45,098 $ 27,864
Professional services 23,183 18,598 8,022
Occupancy related costs 39,917 38,262 28,424
Amortization of intangible assets 41,135 37,680 28,176
Depreciation and amortization 9,781 7,548 4,633
Marketing costs 27,499 24,130 5,028
Other 24,456 30,417 11,663
Total $ 220,868 $ 201,733 $ 113,810