SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Selling, General and Administrative Expense [Abstract]
Compensation and benefits	$ 45,098		$ 27,864	$ 21,166
Professional services	18,598		8,022	9,864
Occupancy related costs	38,262		28,424	24,041
Amortization of intangible assets	37,680		28,176	5,030
Depreciation and amortization	7,548		4,633	2,609
Change in the fair value of Equator Earn Out	(37,924)		0	0
Goodwill impairment	37,473	[1]	0	0
Marketing costs	24,130		5,028	2,500
Other	30,417		11,663	9,502
Total	$ 201,282		$ 113,810	$ 74,712

[1] See Note 5 for a discussion of the Equator goodwill impairment.