ACQUISITIONS - CastleLine (Details) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
	Jul. 17, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquisitions
Value of common stock paid at acquisition		$ 21,733	$ 0	$ 0
Goodwill		$ 82,801	$ 90,851	$ 99,414
CastleLine
Acquisitions
Cash paid at acquisition	$ 12,300
Accounts Payable	$ 10,500
Business Combination, Contingent Consideration Arrangements, Payment Period	4 years
Number of shares exchanged for acquisition	495
Value of common stock paid at acquisition	$ 14,400
Additional consideration	3,800
Cash	1,088
Accounts receivable, net	510
Prepaid expenses and Other assets	66
Restricted Cash	2,501
Non-Compete Agreements	1,105
Database/Others	465
Customer relationship	395
Trademark and Trade Names	150
Goodwill	28,125
Assets acquired	34,405
Accounts payable and accrued expenses	(875)
Deferred Revenue	(87)
Purchase price	$ 33,443