BUSINESS INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Business information
Total revenues	$ 99,412	$ 114,517
Total assets	334,934		464,249
Client | Revenue
Business information
Number of clients	1	1
United States
Business information
Total revenues	69,431	97,905
Total assets	273,413		378,573
Europe
Business information
Total revenues	25,422	10,549
Total assets	31,622		52,975
Rest of world
Business information
Total revenues	4,559	6,063
Total assets	$ 29,899		$ 32,701