BUSINESS INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business information
Total revenues	$ 173,258	$ 126,364
Total assets	555,041		$ 598,800
United States
Business information
Total revenues	138,402	106,733
Total assets	471,993		506,748
Europe
Business information
Total revenues	22,019	10,794
Total assets	26,369		31,341
Rest Of World
Business information
Total revenues	12,837	$ 8,837
Total assets	$ 56,679		$ 60,711