ACCOUNTING POLICIES (Details 4) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets
Intangible assets, gross	$ 17,571	$ 17,356
Less: accumulated amortization of acquired intangible assets	(9,283)	(6,443)
Total intangible assets, net	8,288	10,913
Acquired intangible assets
Finite-Lived Intangible Assets
Intangible assets, gross	16,000	16,000
Intangible assets, other
Finite-Lived Intangible Assets
Intangible assets, gross	$ 1,571	$ 1,356
Intangible assets, other | Weighted average
Finite-Lived Intangible Assets
Useful life of intangible assets	3 years 6 months