SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES
Compensation and benefits	$ 27,864	$ 21,166	$ 22,327
Professional services	8,022	9,864	6,658
Occupancy related costs	28,424	24,041	17,824
Amortization of intangible assets	28,176	5,030	5,291
Depreciation and amortization	4,633	2,609	2,097
Other	16,691	12,002	7,934
Total	$ 113,810	$ 74,712	$ 62,131